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Testing 1,600 Emails on SMTPing vs ClearOut: Shocking Results!

23 min read
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In today’s digital age, email marketing remains a crucial tool for businesses to connect with their audience. However, the effectiveness of email campaigns heavily relies on the quality of your email list. This is where email validation tools come into play. In this in-depth review, we’ll be comparing two popular email validation services: SMTPing and ClearOut. We’ll put these tools to the test by validating 1,600 email addresses and analyzing the results to help you make an informed decision about which service might be right for your business needs. Whether you’re a seasoned marketer or just starting out, understanding the nuances of email validation can significantly impact your marketing success. Let’s dive in and explore the fascinating world of email validation tools!

What is Email Validation? [00:46]

Email validation is a critical process in maintaining a healthy email marketing strategy. It’s the practice of verifying the authenticity and deliverability of email addresses in your mailing list. But why is this so important?

The Importance of Email Validation

  • Protecting Your Sender Reputation: Email service providers closely monitor your sending practices. If you consistently send emails to invalid addresses, it can negatively impact your sender reputation, potentially leading to your emails being blocked or marked as spam.
  • Improving Deliverability Rates: By removing invalid email addresses from your list, you increase the chances of your emails reaching their intended recipients’ inboxes.
  • Cost-Efficiency: Many email marketing platforms charge based on the number of subscribers. Validating your list ensures you’re not paying for invalid contacts.
  • Accurate Analytics: With a clean email list, you can get more accurate insights into your email campaign performance, as you’re not skewing data with bounces from invalid addresses.

Common Email Validation Issues

  • Typos and Mistakes: Users might accidentally misspell their email addresses when signing up.
  • Fake Email Addresses: Some people intentionally provide false email addresses to access content without receiving future communications.
  • Outdated Addresses: Over time, some email addresses on your list may become inactive or closed.
  • Disposable Email Addresses: These are temporary email addresses used to avoid giving out a primary email address.

By using email validation tools like SMTPing or ClearOut, you can identify and address these issues, ensuring that your email list remains clean and effective for your marketing efforts.

Plans & Pricing [01:35]

When it comes to email validation services, pricing can vary significantly. Let’s take a closer look at the pricing structure of SMTPing, which offers an intriguing lifetime deal through AppSumo.

SMTPing’s Unique Offering

SMTPing stands out in the market with its innovative approach to pricing:

  • Monthly Recurring Credits: Unlike many one-time use credit systems, SMTPing offers monthly recurring credits for a one-time purchase.
  • Tiered Pricing Structure: SMTPing provides multiple tiers to cater to different business needs and scales.

Tier Breakdown

Tier 1:

  • 30,000 email validations per month
  • Price: $39 (one-time purchase)

Tier 2:

  • Higher number of monthly validations
  • Additional one-time use credits

Tier 3:

  • Further increased monthly validations
  • Additional one-time use credits

Tier 4:

  • 1 million validations per month
  • 250,000 extra one-time use credits
  • Price: $349 (one-time purchase)

Comparison to Market Rates

To put SMTPing’s pricing into perspective, let’s compare it to standard market rates:

  • Industry Average: Many email validation services charge around $0.01 per email validation.
  • 1 Million Validations: At market rates, this would typically cost around $10,000.
  • SMTPing’s Offer: 1 million validations per month for a one-time fee of $349.

Potential for Reselling

This pricing structure opens up interesting possibilities for agencies or consultants:

  • Resell Opportunity: Purchase SMTPing at the lifetime deal price and offer email validation services to clients at market rates.
  • Recurring Revenue: With monthly renewing credits, you can establish a steady stream of income from email validation services.


While the pricing is attractive, it’s important to consider:

  • Service Quality: Ensure the validation accuracy meets your needs before committing.
  • Feature Set: Compare the features offered by SMTPing to other services in the market.
  • Long-term Viability: Consider the sustainability of this pricing model for the service provider.

SMTPing’s unique pricing structure offers an enticing proposition for businesses of all sizes. However, as we’ll explore in the following sections, price is just one factor to consider when choosing an email validation service.

Comparing SMTPing to ClearOut [02:44]

To get a clear picture of SMTPing’s performance and value, we’ll be comparing it to ClearOut, an established player in the email validation market. This comparison will help us understand how SMTPing stacks up against a more mature service.

Why Compare to ClearOut?

  • Established Service: ClearOut has been in the market for several years and has built a reputation for reliability.
  • Feature-Rich: ClearOut offers a comprehensive set of features that we can use as a benchmark.
  • Different Pricing Model: ClearOut uses a more traditional pricing structure, allowing us to compare value propositions.

Comparison Criteria

We’ll be evaluating both services based on the following:

  1. Accuracy of Validation: How well do they identify valid and invalid email addresses?
  2. User Interface: How easy and intuitive is each service to use?
  3. Features: What additional tools and capabilities does each service offer?
  4. Integration Options: How well do they integrate with other marketing tools and platforms?
  5. Pricing: How do their pricing structures compare in terms of value for money?
  6. Export Options: How flexible are their data export capabilities?


To ensure a fair comparison, we’ll be:

  • Using the same list of 1,600 email addresses for both services
  • Analyzing the results in detail, including any discrepancies between the two services
  • Testing both single email validation and bulk validation features
  • Exploring the user interface and additional tools of both platforms

By the end of this comparison, you’ll have a comprehensive understanding of how SMTPing performs against an established competitor like ClearOut, helping you make an informed decision about which service might be best for your email validation needs.

SMTPing Interface [03:02]

The user interface of an email validation tool plays a crucial role in its usability and efficiency. Let’s take a closer look at SMTPing’s interface and how it facilitates the email validation process.

Dashboard Overview

SMTPing’s dashboard provides a simple and straightforward interface:

  • Analytics at a Glance: The main screen displays basic analytics about your email validation usage.
  • Verification Analytics: A visual representation of your validation results, showing the breakdown of valid, invalid, and unknown email addresses.
  • Credit Usage Meter: Clearly shows how many credits you’ve used out of your total allocation.
  • Monthly Usage Graph: Displays your credit usage over the current month.

Key Features of the Interface


  • The interface is minimal, focusing on essential features.
  • Navigation is straightforward, with only a few main screens to interact with.

Visual Representation:

  • Graphs and charts make it easy to understand your validation results at a glance.
  • Color coding helps quickly identify different categories of email addresses.

Credit Tracking:

  • The prominent display of credit usage helps you keep track of your account status.

Historical Data:

  • The history section allows you to review past validation results.

Areas for Improvement

While the interface is functional, there are some areas where it could be enhanced:

  • Customizable Dashboard: The ability to customize the dashboard view would be beneficial for users with specific monitoring needs.
  • Detailed Analytics: More in-depth analytics options could provide valuable insights for users managing multiple email lists.
  • Date Range Selection: The ability to view usage data for custom date ranges would enhance the utility of the usage graph.
  • Exportable Reports: Adding options to export dashboard data and analytics would be useful for reporting purposes.

User Experience Considerations

  • Learning Curve: The simplicity of the interface means new users can quickly get started with email validation.
  • Efficiency: With all main features accessible from the dashboard, users can perform validations and check results efficiently.
  • Scalability: As SMTPing adds more features, careful consideration will be needed to maintain the current level of simplicity while accommodating new functionalities.

The SMTPing interface provides a clean, no-frills approach to email validation. While it may lack some advanced features found in more established tools, its simplicity could be a significant advantage for users who prioritize ease of use and quick results.

Single Email Validations [04:05]

Single email validation is a crucial feature for businesses that need to verify individual email addresses on the fly. Let’s explore how SMTPing handles this task and compare it to ClearOut’s approach.

SMTPing’s Single Email Validation

SMTPing offers a straightforward process for validating individual email addresses:

  1. Access: The single email validation feature is easily accessible from the main dashboard.
  2. Input: Users can type or paste an email address into a designated box.
  3. Validation Process: Clicking the “Check” button initiates the validation process.
  4. Results Display: The system runs various checks and displays the results, including:
  • Overall validity status
  • Detailed breakdown of checks performed
  • Any specific issues identified (e.g., graylisting)

Key Features of SMTPing’s Single Validation

  • Real-Time Checks: SMTPing performs live checks without actually sending emails.
  • Detailed Output: The system provides a comprehensive breakdown of the validation process.
  • Command Line Display: Users can see the validation process in real-time through a command-line interface display.
  • Quick Results: The validation process is typically completed within seconds.

Use Cases for Single Email Validation

  • In-Person Sign-ups: Verify email addresses collected at events or in-store.
  • Customer Support: Quickly validate an email address while on a call with a customer.
  • Form Submissions: Integrate with web forms to validate emails as they’re submitted.
  • Data Cleanup: Verify individual emails when cleaning up small lists or investigating bounces.

Comparison to ClearOut

While both SMTPing and ClearOut offer single email validation, there are some differences:


  • SMTPing: Simple, focused interface
  • ClearOut: More comprehensive interface with additional details

Result Clarity:

  • SMTPing: Provides detailed results but may require interpretation
  • ClearOut: Offers clear, definitive results (e.g., “Valid” or “Invalid”)

Additional Information:

  • SMTPing: Focuses on technical details of the validation process
  • ClearOut: May provide additional insights about the email address or domain

Best Practices for Single Email Validation

  • Regular Use: Incorporate single email validation into your regular workflow to maintain list hygiene.
  • Immediate Verification: Validate emails at the point of collection to ensure accuracy from the start.
  • Follow-up Actions: Develop a process for handling emails that return uncertain results.
  • Integration: Consider integrating single email validation with your CRM or email marketing platform for seamless verification.

Single email validation is a powerful tool for maintaining email list quality on an ongoing basis. While SMTPing provides a functional solution for this task, users should consider their specific needs and preferences when choosing between SMTPing and more established alternatives like ClearOut.

Bulk Email Validations [05:33]

Bulk email validation is a critical feature for businesses managing large email lists. It allows for efficient verification of multiple email addresses simultaneously. Let’s examine how SMTPing handles bulk validations and compare it to ClearOut’s approach.

SMTPing’s Bulk Validation Process

SMTPing offers a straightforward process for bulk email validation:

  1. CSV Upload: Users can upload a CSV file containing their email list.
  2. Column Selection: The system prompts users to select the column containing email addresses.
  3. Initiation: Users click “Verify List” to start the validation process.
  4. Processing: SMTPing processes the list, validating each email address.
  5. Results: The system provides a breakdown of validation results.

Key Features of SMTPing’s Bulk Validation

  • Large List Handling: Capable of processing lists with thousands of email addresses.
  • Progress Tracking: Users can monitor the validation progress in real-time.
  • Result Categories: Emails are categorized as valid, invalid, unknown, or catch-all.
  • Duplicate Detection: The system identifies and flags duplicate email addresses.

Bulk Validation Use Cases

  • List Cleanup: Regularly validate and clean large email lists to maintain high deliverability rates.
  • New List Verification: Validate newly acquired email lists before running campaigns.
  • Pre-Campaign Check: Verify your entire list before sending out important email campaigns.
  • Database Maintenance: Periodically validate your entire customer or prospect database.

Comparison to ClearOut

Both SMTPing and ClearOut offer bulk validation, but there are some differences:

Processing Speed:

  • SMTPing: Speed may vary depending on list size
  • ClearOut: Known for fast processing of large lists

Result Detail:

  • SMTPing: Provides basic categorization of results
  • ClearOut: Offers more detailed categorization and insights

Integration Options:

  • SMTPing: Limited integrations currently available
  • ClearOut: Offers integrations with various email marketing platforms

Export Options:

  • SMTPing: Basic export options
  • ClearOut: More flexible export options, allowing for customized result downloads

Best Practices for Bulk Email Validation

  • Regular Validation: Set a schedule for regular bulk validation of your entire email list.
  • Segmentation: Use validation results to segment your list for targeted campaigns.
  • Pre-Import Validation: Always validate new lists before importing them into your email marketing platform.
  • Result Analysis: Take time to analyze validation results to understand patterns and improve list quality over time.
  • Follow-up Actions: Develop a process for handling different result categories (e.g., removing invalid emails, investigating unknowns).

Bulk email validation is an essential tool for maintaining large email lists and ensuring high deliverability rates. While SMTPing provides a functional solution for bulk validation, users should consider their specific needs, especially in terms of processing speed, result detail, and integration options, when choosing between SMTPing and more established alternatives like ClearOut.

CSV Validator Tool [06:22]

In addition to email validation, SMTPing offers a CSV validator tool, which is a unique feature that can be particularly useful for businesses dealing with large datasets. Let’s explore this tool and its potential benefits.

Understanding the CSV Validator Tool

The CSV validator tool is designed to check the integrity and structure of CSV files before they are used for email validation or other purposes.

Key features of the CSV Validator Tool:

  • File Structure Check: Ensures that the CSV file is properly formatted and can be read correctly.
  • Error Detection: Identifies any errors in the CSV file structure.
  • Column Validation: Verifies that the necessary columns (like email addresses) are present and correctly labeled.
  • Data Consistency: Checks for consistency in data formats across rows.

Benefits of CSV Validation

Prevent Processing Errors:

  • Catch and fix CSV issues before they cause problems in the email validation process.
  • Save time by identifying file problems early in the workflow.

Improve Data Quality:

  • Ensure that your email lists are properly structured before validation.
  • Identify and correct inconsistencies in your data.

Streamline Workflows:

  • Reduce the likelihood of errors during bulk email validation.
  • Minimize the need for manual checks and corrections.

Enhance Accuracy:

  • By ensuring clean, well-structured data, you improve the overall accuracy of your email validation results.

Use Cases for the CSV Validator Tool

  • Pre-Validation Check: Run your CSV files through the validator before submitting them for email validation.
  • Data Import Preparation: Validate CSV files before importing them into your CRM or email marketing platform.
  • Troubleshooting: Use the tool to identify issues when experiencing problems with bulk email validation.
  • Data Standardization: Ensure all your CSV files meet a consistent standard before processing.

Best Practices for Using the CSV Validator Tool

  • Regular Use: Make CSV validation a standard part of your data preparation process.
  • Error Resolution: Develop a process for addressing and correcting errors identified by the validator.
  • Documentation: Keep a record of common CSV issues for future reference and team training.
  • Integration: Consider integrating the CSV validation step into your automated workflows.

The CSV Validator Tool is a valuable addition to SMTPing’s feature set, offering users an extra layer of data quality assurance. While it may seem like a small feature, it can significantly impact the efficiency and accuracy of your email validation process, especially when dealing with large or complex datasets. This tool sets SMTPing apart from some competitors and can be particularly valuable for businesses that frequently work with CSV files from various sources.

Comparing SMTPing to ClearOut [06:45]

To get a comprehensive understanding of SMTPing’s performance and capabilities, we’ll now dive into a detailed comparison with ClearOut, an established player in the email validation market. This comparison will help us assess SMTPing’s strengths and potential areas for improvement.

Pricing Comparison


  • Offers a lifetime deal through AppSumo
  • Tier 1: 30,000 validations per month for $39 (one-time fee)
  • Tier 4: 1 million validations per month for $349 (one-time fee)


  • Uses a more traditional pricing model
  • 30,000 credits: $174
  • 1 million credits: $1,100

Validation Accuracy

To test the accuracy of both services, we validated a list of 1,600 email addresses using both SMTPing and ClearOut. Here’s what we found:

SMTPing Results:

  • Valid emails: 1,331
  • Invalid emails: 158
  • Unknown: 41
  • Catch-all: 56
  • Duplicates: 5

ClearOut Results:

  • Guaranteed deliverable: 1,307
  • Valid emails: Higher than SMTPing (exact number not specified)
  • Additional categories: Disposable accounts, free accounts, role accounts

Key Differences in Results

  • Categorization: ClearOut provides more detailed categorization of email addresses.
  • Guaranteed Deliverables: ClearOut offers a “guaranteed deliverable” category, which SMTPing doesn’t have.
  • Discrepancies: There were about 100 email addresses that the two services disagreed on in terms of validity.

User Interface and Features


  • Simple, straightforward interface
  • Basic analytics and reporting
  • CSV validator tool
  • Limited export options


  • More comprehensive interface
  • Detailed analytics and reporting
  • Various integrations with email marketing platforms
  • Flexible export options

Integration Capabilities


  • Currently limited integrations
  • Potential for future expansion


  • Integrations with various platforms like WordPress, Mailchimp, ActiveCampaign, etc.
  • API for custom integrations

Export Options


  • Basic export options (all results, clean results, PDF report)
  • Limited flexibility in choosing which data to export


  • Flexible export options
  • Ability to customize exports based on specific criteria

Pros and Cons Summary

SMTPing Pros:

  • Attractive pricing with lifetime deal
  • Simple, easy-to-use interface
  • CSV validator tool

SMTPing Cons:

  • Limited features compared to established competitors
  • Fewer integration options
  • Basic export capabilities

ClearOut Pros:

  • Established reputation
  • Detailed categorization of email addresses
  • Numerous integrations
  • Flexible export options

ClearOut Cons:

  • Higher pricing
  • More complex interface (could be a pro for some users)

This comparison reveals that while SMTPing offers an attractive pricing model and a user-friendly interface, it currently lacks some of the advanced features and integrations offered by more established services like ClearOut. However, for businesses prioritizing cost-effectiveness and simplicity, SMTPing could be a viable option, especially if they’re willing to work with its current limitations.

ClearOut – Single Email Validation [07:52]

To further understand the differences between SMTPing and ClearOut, let’s take a closer look at ClearOut’s single email validation feature. This comparison will help highlight the strengths and potential areas for improvement in SMTPing’s offering.

ClearOut’s Single Email Validation Process

  1. Access: The single email validation feature is easily accessible from ClearOut’s main dashboard.
  2. Input: Users can enter an email address into a designated field.
  3. Validation: Clicking a “Validate” button initiates the process.
  4. Results Display: ClearOut provides a clear, detailed result of the validation.

Key Features of ClearOut’s Single Validation

  • Instant Results: ClearOut typically provides validation results within seconds.
  • Clear Status Indication: Results are presented with a straightforward “Valid” or “Invalid” status.
  • Detailed Breakdown: The system offers a comprehensive analysis of the email address.
  • Additional Insights: ClearOut may provide extra information about the email or domain.

Comparison to SMTPing’s Single Validation

Result Clarity:

  • ClearOut: Provides a definitive “Valid” or “Invalid” result
  • SMTPing: Offers detailed results that may require interpretation

Additional Information:

  • ClearOut: Often provides extra insights about the email or domain
  • SMTPing: Focuses more on the technical details of the validation process

User Interface:

  • ClearOut: More comprehensive interface with additional details
  • SMTPing: Simpler, more focused interface

Technical Display:

  • ClearOut: Emphasizes user-friendly result presentation
  • SMTPing: Includes a command-line interface display, which may appeal to more technical users

Use Cases for ClearOut’s Single Validation

  • Customer Onboarding: Verify email addresses during the sign-up process.
  • Lead Qualification: Quickly validate email addresses of potential leads.
  • Data Entry: Check email addresses as they’re manually entered into a system.
  • Customer Support: Verify customer email addresses during support interactions.

Best Practices for Using ClearOut’s Single Validation

  • Real-time Verification: Implement single email validation at the point of collection.
  • Integration: Utilize ClearOut’s API to integrate validation into your existing systems.
  • Training: Ensure team members understand how to interpret and act on validation results.
  • Follow-up Process: Develop a clear process for handling emails that return as invalid or risky.

While both SMTPing and ClearOut offer single email validation, ClearOut’s more established position in the market is reflected in its feature set. The clear, definitive results and additional insights provided by ClearOut can be particularly valuable for businesses that require in-depth email analysis. However, SMTPing’s simpler interface and technical display may appeal to users who prefer a more straightforward approach or enjoy seeing the validation process in action.

SMTPing Results [08:48]

After running our test of 1,600 email addresses through SMTPing, let’s take a closer look at the results and what they mean for users of the service.

Breakdown of SMTPing Results

SMTPing categorized the 1,591 unique email addresses (after removing 5 duplicates) as follows:

  1. Valid Emails: 1,331
  2. Invalid Emails: 158
  3. Unknown: 41
  4. Catch-all: 56
  5. Duplicates: 5

Understanding SMTPing’s Categories

  • Valid Emails: These are addresses that SMTPing considers safe to send emails to. They have passed various checks and are likely to be deliverable.
  • Invalid Emails: These addresses failed SMTPing’s validation checks and are considered undeliverable. Sending to these could harm your sender reputation.
  • Unknown: SMTPing couldn’t definitively determine the status of these emails. They may require further investigation or careful handling.
  • Catch-all: These are addresses associated with domains that accept all incoming email, regardless of whether the specific address exists. They pose a potential risk as they may or may not be valid.
  • Duplicates: These are repeated email addresses in your list. Removing duplicates helps maintain list hygiene and prevents sending multiple emails to the same recipient.

Key Insights from SMTPing Results

  1. High Valid Rate: With 1,331 out of 1,591 emails (83.7%) classified as valid, the list appears to be of relatively good quality.
  2. Significant Invalid Count: 158 invalid emails (9.9%) is a notable number. Removing these can significantly improve deliverability and sender reputation.
  3. Uncertain Categories: The combined 97 emails (6.1%) in the “Unknown” and “Catch-all” categories represent a gray area that may require further attention.
  4. Low Duplicate Rate: Only 5 duplicates (0.3%) suggests good initial list management.

Implications for Email Marketing

  • List Cleaning: Remove the 158 invalid emails to immediately improve your list quality.
  • Deliverability Improvement: By focusing on the 1,331 valid emails, you can expect better deliverability rates.
  • Risk Management: Consider how to handle the “Unknown” and “Catch-all” addresses based on your risk tolerance.
  • List Segmentation: Use these results to create segments for targeted campaigns or further verification.

Limitations of SMTPing Results

  • Lack of Detailed Categorization: Unlike some competitors, SMTPing doesn’t provide more nuanced categories like disposable or role-based emails.
  • Unknown Emails: The presence of “Unknown” results may require additional verification methods for complete list cleaning.
  • Catch-all Handling: The relatively high number of catch-all addresses may pose challenges in determining true deliverability.

Best Practices Based on SMTPing Results

  1. Regular Validation: Implement a routine of regular list validation to maintain high list quality.
  2. Segmentation Strategy: Develop a strategy for handling different email categories, especially “Unknown” and “Catch-all” addresses.
  3. Monitoring and Tracking: Keep track of email performance for different categories to refine your validation strategy over time.
  4. Continuous Improvement: Use these results as a baseline and aim to improve your valid email percentage in future validations.

SMTPing’s results provide a solid foundation for improving email list quality. While the categorization is not as detailed as some competitors, it offers clear actionable insights for most email marketing needs. Users should consider these results in the context of their specific email marketing goals and risk tolerance.

ClearOut Results [09:59]

To provide a comprehensive comparison, let’s analyze the results obtained from validating the same list of 1,600 email addresses using ClearOut. This analysis will help us understand the differences in approach and detail between SMTPing and ClearOut.

Breakdown of ClearOut Results

ClearOut categorized the 1,591 unique email addresses (after removing 5 duplicates) as follows:

  1. Guaranteed Deliverable: 1,307
  2. Valid Emails: Higher than SMTPing’s count (exact number not specified in the transcript)
  3. Invalid Emails: Present, but exact number not specified
  4. Disposable Accounts: Identified, but number not specified
  5. Free Accounts: Identified, but number not specified
  6. Role Accounts: 28 (2% of the list)
  7. Duplicates: 5

Understanding ClearOut’s Categories

  • Guaranteed Deliverable: Emails that ClearOut is highly confident are valid and deliverable.
  • Valid Emails: Addresses that passed validation checks but may include some risk categories.
  • Invalid Emails: Addresses that failed validation checks and are considered undeliverable.
  • Disposable Accounts: Temporary email addresses often used to avoid giving out a primary email.
  • Free Accounts: Emails from free providers like Gmail, Yahoo, AOL, etc.
  • Role Accounts: Generic addresses like “info@”, “support@”, “sales@”, etc.
  • Duplicates: Repeated email addresses in the list.

Key Insights from ClearOut Results

  1. High Confidence Deliverables: With 1,307 guaranteed deliverable emails, ClearOut provides a high level of confidence for a significant portion of the list.
  2. Detailed Categorization: ClearOut offers more nuanced categories compared to SMTPing, providing deeper insights into the nature of the email addresses.
  3. Risk Assessment: By identifying disposable and role accounts, ClearOut helps in assessing potential risks in the email list.
  4. Quality Indicators: The breakdown of free vs. custom domain emails can be an indicator of list quality for B2B marketers.

Implications for Email Marketing

  • Targeted Campaigns: Use the detailed categorization to create highly targeted email campaigns.
  • Risk Mitigation: Consider separate strategies for disposable and role accounts to manage potential risks.
  • List Quality Assessment: Use the breakdown of free vs. custom domain emails to gauge the overall quality of your list, especially for B2B marketing.
  • Deliverability Optimization: Focus on the guaranteed deliverable emails for critical campaigns to ensure the highest possible deliverability rates.

Comparison to SMTPing Results

  1. Confidence Level: ClearOut’s “Guaranteed Deliverable” category provides a higher level of confidence compared to SMTPing’s “Valid” category.
  2. Categorization Detail: ClearOut offers more detailed categorization, which can be particularly useful for sophisticated email marketing strategies.
  3. Risk Identification: ClearOut’s identification of disposable and role accounts provides additional risk management capabilities not present in SMTPing’s results.
  4. Consistency: Both services identified the same number of duplicates, indicating consistency in basic list analysis.

Best Practices Based on ClearOut Results

  1. Segmentation: Utilize the detailed categories to create highly segmented email lists for targeted campaigns.
  2. Risk Management: Develop specific strategies for handling disposable and role accounts based on your risk tolerance and marketing goals.
  3. Quality Improvement: Use the insights on free vs. custom domain emails to guide list acquisition and growth strategies.
  4. Continuous Monitoring: Regularly validate your list and track changes in these categories to maintain high list quality over time.

ClearOut’s results provide a more detailed and nuanced view of the email list compared to SMTPing. This level of detail can be particularly valuable for businesses with complex email marketing needs or those operating in industries with high compliance requirements. However, for users with simpler needs, this level of detail might be overwhelming, and SMTPing’s more straightforward categorization could be sufficient.

Results Comparison [11:53]

Now that we have examined the results from both SMTPing and ClearOut, let’s compare them side by side to understand the similarities, differences, and implications for users.

Direct Comparison of Results

Valid Emails:

  • SMTPing: 1,331 valid emails
  • ClearOut: 1,307 guaranteed deliverable emails

Invalid Emails:

  • SMTPing: 158 invalid emails
  • ClearOut: Exact number not specified, but present

Uncertain Categories:

  • SMTPing: 41 unknown, 56 catch-all
  • ClearOut: More detailed categories including disposable and role accounts


  • Both services identified 5 duplicate emails

Key Differences in Categorization

Confidence Levels:

  • SMTPing uses a broader “valid” category
  • ClearOut introduces a “guaranteed deliverable” category for high-confidence emails

Granularity of Results:

  • SMTPing offers basic categories (valid, invalid, unknown, catch-all)
  • ClearOut provides more detailed categories (disposable, free, role accounts)

Risk Assessment:

  • SMTPing’s “unknown” and “catch-all” categories indicate potential risks
  • ClearOut explicitly identifies risky categories like disposable and role accounts

Discrepancies in Results

The transcript mentions some interesting discrepancies between the two services:

  • 67 email addresses marked as valid by SMTPing were not considered valid by ClearOut
  • 37 email addresses marked as valid by ClearOut were not considered valid by SMTPing

These discrepancies account for about 100 email addresses where the two services disagree, representing approximately 6.3% of the total list.

Implications of Discrepancies

  1. Accuracy Concerns: The disagreement between services raises questions about the absolute accuracy of email validation tools.
  2. Conservative vs. Liberal Validation: One service may be more conservative in its approach, potentially leading to fewer false positives but more false negatives, and vice versa.
  3. Need for Multiple Validations: For critical email lists, users might consider using multiple validation services to cross-reference results.
  4. Risk Tolerance: Users need to consider their risk tolerance when deciding how to handle emails with conflicting validation results.

Choosing Between SMTPing and ClearOut

Factors to consider when choosing between the two services:

  1. Simplicity vs. Detail: SMTPing offers a simpler, more straightforward approach, while ClearOut provides more detailed insights.
  2. Cost Effectiveness: SMTPing’s lifetime deal may be more cost-effective for high-volume users.
  3. Risk Management: ClearOut’s detailed categorization may be preferable for users with strict risk management requirements.
  4. Integration Needs: ClearOut currently offers more integration options, which may be crucial for some users
  5. Scalability: Consider how each service’s features and pricing model align with your expected growth in email list size and validation needs.
  6. Support and Development: Evaluate the level of support and ongoing development offered by each service, especially given SMTPing’s newer status in the market.

Best Practices for Handling Discrepancies

  1. Conservative Approach: For critical communications, consider treating emails with conflicting results as potentially risky.
  2. Segmentation: Create a separate segment for emails with conflicting results for further analysis or careful handling.
  3. Manual Review: For smaller lists or high-value contacts, consider manual review of conflicting results.
  4. Testing: Send test campaigns to conflicting emails to gauge actual deliverability and engagement.
  5. Continuous Validation: Regularly revalidate your list, especially the conflicting emails, to track changes over time.

Disclaimer [12:46]

It’s important to note that while this comparison provides valuable insights, there are some limitations and considerations to keep in mind:

Limitations of the Comparison

  1. Sample Size: The test was conducted on a list of 1,600 emails, which may not be representative of all possible email scenarios.
  2. Timeframe: Email validity can change over time, so results may vary if the test is repeated at a different time.
  3. List Composition: The specific composition of the test list (e.g., B2B vs. B2C, industry sectors) may impact the results.
  4. Service Updates: Both SMTPing and ClearOut may update their algorithms and features, potentially changing results over time.

Considerations for Users

  1. Individual Needs: The best service for you depends on your specific needs, budget, and email marketing strategy.
  2. Evolving Technology: Email validation technology is continually evolving, so staying informed about updates is crucial.
  3. Compliance Requirements: Ensure that your chosen validation service meets any industry-specific compliance requirements you may have.
  4. Supplementary Tools: Consider using email validation as part of a broader email hygiene strategy, including bounce handling and engagement tracking.

Importance of Ongoing Evaluation

  1. Regular Testing: Periodically test both services with your own email lists to ensure consistent performance.
  2. Feature Updates: Keep track of new features and improvements in both services to ensure you’re maximizing their potential.
  3. Industry Benchmarks: Compare your results against industry benchmarks to gauge the overall health of your email list.
  4. User Community: Engage with user communities or forums to learn from others’ experiences with these services.

By keeping these factors in mind, users can make a more informed decision about which email validation service best suits their needs. Remember that while this comparison provides valuable insights, it’s always best to test services with your own data and in the context of your specific email marketing goals.

Integrations [14:12]

One of the key factors in choosing an email validation service is its ability to integrate with other tools in your marketing stack. Let’s compare the integration capabilities of SMTPing and ClearOut to help you understand which might better fit into your existing workflows.

SMTPing Integrations

As a newer service, SMTPing currently has limited integration options:

  1. API Access: While not explicitly mentioned, it’s likely that SMTPing offers API access for custom integrations.
  2. Future Potential: As a new service, there’s potential for SMTPing to expand its integration offerings in the future.

ClearOut Integrations

ClearOut, being a more established service, offers a wider range of integrations:

  1. WordPress: Direct integration with WordPress sites for real-time validation.
  2. Email Marketing Platforms: Integrations with popular platforms like Mailchimp, MooSend, and ActiveCampaign.
  3. CRM Systems: Potential integrations with Customer Relationship Management systems.
  4. Automation Tools: Integration with tools like Zapier and Make (formerly Integromat) for creating custom workflows.
  5. API Access: Robust API for custom integrations and advanced use cases.

Comparison of Integration Capabilities

Ease of Use:

  • SMTPing: Limited integrations may mean more manual work or custom development needed.
  • ClearOut: Wide range of pre-built integrations allows for easier setup with popular tools.


  • SMTPing: Potentially more flexible for custom solutions if API access is available.
  • ClearOut: Offers both pre-built integrations and API access for maximum flexibility.

Time to Implement:

  • SMTPing: May require more time for setup due to limited pre-built integrations.
  • ClearOut: Faster implementation with existing tools due to ready-made integrations.

Ecosystem Compatibility:

  • SMTPing: Currently limited ecosystem compatibility.
  • ClearOut: Wide compatibility with various marketing and automation tools.

Implications for Users

  1. Workflow Efficiency: ClearOut’s integrations may offer more immediate efficiency gains in existing workflows.
  2. Custom Solutions: For users needing highly customized solutions, SMTPing’s potential API access could be sufficient.
  3. Future-Proofing: Consider SMTPing’s potential for future integrations versus ClearOut’s established integrations.
  4. Technical Resources: Evaluate your team’s technical capabilities for implementing custom integrations if needed with SMTPing.

Best Practices for Integration

  1. Audit Current Tools: List all the tools in your current marketing stack that could benefit from email validation integration.
  2. Prioritize Key Integrations: Identify which integrations are most critical for your workflows.
  3. Consider Future Needs: Think about tools you might adopt in the future and their integration requirements.
  4. Test Integrations: If possible, test integrations in a sandbox environment before full implementation.
  5. Monitor Performance: Regularly assess the performance and efficiency gains from your integrations.

Potential Integration Use Cases

  1. Real-time Validation: Integrate with web forms for instant validation at the point of capture.
  2. Bulk List Cleaning: Integrate with your CRM or email marketing platform for regular list cleaning.
  3. Automated Workflows: Use integrations to trigger actions based on validation results (e.g., moving invalid emails to a separate list).
  4. Data Enrichment: Combine email validation with other data enrichment tools for comprehensive contact management.

While ClearOut currently offers a more comprehensive set of integrations, SMTPing’s potential for future development should not be overlooked. Users should weigh the immediate benefits of ClearOut’s integrations against the potential long-term value and cost-effectiveness of SMTPing, considering their specific integration needs and technical capabilities.

SMTPing Export Options [15:11]

The ability to export validation results effectively is crucial for managing email lists and integrating results into your marketing workflows. Let’s examine SMTPing’s export options and compare them to industry standards.

SMTPing’s Current Export Options

SMTPing offers three basic export options:

  1. All Results: Exports the complete list of validated emails with their respective statuses.
  2. Clean Results: Exports only the emails that were validated as “clean” or valid.
  3. Export Report: Generates a PDF report summarizing the validation results.

Limitations of SMTPing’s Export Options

  1. Limited Customization: Users cannot choose specific categories or combinations of results to export.
  2. Lack of Flexible Formats: The transcript doesn’t mention options for different file formats (e.g., CSV, Excel).
  3. No Selective Criteria: Unable to export based on specific criteria or combinations of validation results.

Comparison to Industry Standards (e.g., ClearOut)

Customization Options:

  • SMTPing: Limited to predefined export options.
  • Industry Standard: Ability to select specific result categories for export.

Format Flexibility:

  • SMTPing: Limited information on available formats.
  • Industry Standard: Multiple format options (CSV, Excel, etc.) to suit different needs.

Granular Control:

  • SMTPing: Lacks granular control over export content.
  • Industry Standard: Often allows users to choose specific fields and criteria for export.

Implications for Users

  1. Workflow Integration: Limited export options may require additional steps to integrate results into existing workflows.
  2. Data Analysis: Restricted ability to perform detailed analysis on specific subsets of the validation results.
  3. Reporting Challenges: The PDF report option is useful, but lack of customization may limit its utility for diverse reporting needs.
  4. Manual Work: Users may need to perform additional manual filtering or processing after export to get desired data subsets.

Best Practices for Working with SMTPing Exports

  1. Post-Export Processing: Develop processes for further filtering and organizing exported data using spreadsheet tools.
  2. Regular Full Exports: Consistently export all results to maintain a comprehensive database of validation history.
  3. Combine with Other Tools: Use the exported data in conjunction with other data analysis tools for more in-depth insights.
  4. Feedback to Developers: Provide feedback to SMTPing about desired export features to help guide future development.

Potential Improvements for SMTPing

  1. Custom Category Selection: Allow users to select specific result categories for export.
  2. Multiple File Formats: Offer exports in various formats like CSV, Excel, and JSON.
  3. Field Selection: Enable users to choose which fields to include in the export.
  4. Conditional Exports: Implement the ability to export based on specific criteria or conditions.
  5. Integration-Friendly Formats: Develop export options that easily integrate with common CRM and email marketing platforms.

Workarounds for Current Limitations

  1. Spreadsheet Filtering: Use spreadsheet software to further filter and categorize the “All Results” export.
  2. Scheduled Exports: Set up regular, scheduled exports to maintain an up-to-date database for analysis.
  3. Macro Development: For advanced users, develop macros in Excel or Google Sheets to automate post-export processing.
  4. Third-Party Tools: Utilize third-party data processing tools to enhance the functionality of SMTPing exports.

While SMTPing’s current export options are basic, they provide the essential functionality for email list management. However, users with more complex needs may find these options limiting. As SMTPing continues to develop, expanding and refining its export capabilities should be a priority to compete with more established services in the email validation market.

Conclusion [16:34]

After a comprehensive analysis of SMTPing and its comparison with ClearOut, we can draw several conclusions to help users make an informed decision about their email validation needs.

Summary of Key Findings

Validation Accuracy:

  • Both SMTPing and ClearOut showed similar overall accuracy, with some discrepancies in specific email classifications.
  • ClearOut offered more detailed categorization, potentially providing deeper insights into list quality.

User Interface:

  • SMTPing offers a simpler, more straightforward interface.
  • ClearOut provides a more comprehensive interface with additional details and options.


  • SMTPing offers basic validation features with a unique CSV validator tool.
  • ClearOut provides more advanced features and detailed email categorization.


  • SMTPing’s lifetime deal through AppSumo offers exceptional value for high-volume users.
  • ClearOut uses a more traditional pricing model, which may be costlier for high-volume validation.


  • SMTPing currently has limited integration options.
  • ClearOut offers a wide range of integrations with popular marketing and automation tools.

Export Options:

  • SMTPing provides basic export functionality.
  • ClearOut offers more flexible and customizable export options.


For Small to Medium Businesses:

  • If budget is a primary concern and basic validation features suffice, SMTPing’s lifetime deal offers excellent value.
  • For those needing more detailed insights and integrations, ClearOut may be worth the higher cost.

For Large Enterprises:

  • ClearOut’s advanced features and integrations may be more suitable for complex email marketing needs.
  • However, SMTPing’s high-volume, low-cost model could be attractive for bulk validation tasks.

For Agencies:

  • SMTPing’s lifetime deal could provide a cost-effective solution for offering email validation services to clients.
  • Agencies requiring detailed reporting and seamless integrations might prefer ClearOut.

For Developers:

  • If API access is available, SMTPing could offer a cost-effective solution for custom integration needs.
  • ClearOut’s established API and integration options provide more immediate development possibilities.

Final Thoughts

SMTPing, while newer to the market, offers a compelling value proposition with its lifetime deal and straightforward approach to email validation. Its simplicity and potential for future development make it an interesting option, especially for users with basic validation needs or those looking for a cost-effective solution for high-volume validation.

ClearOut, as a more established service, provides a comprehensive set of features, detailed categorization, and robust integrations. It’s particularly suited for users with complex email marketing needs or those requiring seamless integration with existing marketing stacks.

Ultimately, the choice between SMTPing and ClearOut (or any other email validation service) should be based on your specific needs, budget, and long-term email marketing strategy. Consider factors such as list size, required accuracy, integration needs, and potential for scaling when making your decision.

Remember that email validation is just one part of a comprehensive email marketing strategy. Whichever tool you choose, it should be complemented by good list acquisition practices, regular list cleaning, and ongoing monitoring of email performance metrics.

As email validation technology continues to evolve, staying informed about new features, improvements, and industry best practices will be crucial for maintaining the health and effectiveness of your email marketing efforts.

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