Use Send Onyx Built in Mail-Tester

Mail-Tester is a valuable tool integrated into Sendonyx and particularly useful in the final stages of setting up an email campaign. It assesses the quality of your email content, checking for factors that might affect deliverability and appearance in the recipient’s inbox. This article explains the importance of using Mail-Tester in SendOnyx and provides a step-by-step guide on how to utilize this feature.

Why Use Mail-Tester?

  1. Spam Score Analysis: Mail-Tester evaluates your email against common spam filters, reducing the likelihood of your email being marked as spam.
  2. Content Review: It checks for issues in your email content that could trigger spam filters or affect deliverability.
  3. Deliverability Insights: Provides feedback on various technical aspects, like email authentication (SPF, DKIM, DMARC), that influence how email services handle your emails.
  4. Pre-Send Optimization: This helps you make necessary adjustments before sending the campaign, ensuring the best possible reception by your audience.

Steps to Use Mail-Tester

Step 1: Finalize Your Email Campaign

  1. Create Your Campaign: In Send Onyx, go through the process of setting up your email campaign, including content creation, recipient selection, and other settings.
  2. Navigate to Campaign Confirmation: On the final page, where you review and confirm the details of your campaign, locate the Mail-Tester option on the bottom.

Step 2: Running Mail-Tester

  1. Find the Mail-Tester Button: At the bottom of the campaign confirmation page, you should see an option or a button for Mail-Tester.
  2. Send Test Email: Click on this button to send a copy of your campaign email to Mail-Tester. This action will not send the email to your actual recipients but only to the Mail-Tester for analysis.

Step 3: Analyzing the Report

  1. View the Report: Once the test email is sent, a new window or tab will open with the Mail-Tester report.
  2. Check Spam Score: Review the spam score and the detailed feedback provided by the Mail-Tester.
  3. Identify Areas for Improvement: Look for any highlighted issues, such as content problems, missing email authentication, or other factors that might affect deliverability and spam rating.

Step 4: Implementing Recommendations

  1. Make Necessary Adjustments: Based on Mail-Tester’s feedback, go back to your email campaign in Send Onyx and make any required changes to the content, settings, or email setup.
  2. Re-test if Needed: After making changes, you can run another Mail-Tester check to ensure improvements have been effective.

Step 5: Finalizing and Launching the Campaign

  • Once you achieve a satisfactory Mail-Tester score, proceed to finalize and launch your email campaign.


Utilizing the Mail-Tester feature is a crucial step in ensuring the quality and deliverability of your email campaigns. By identifying and addressing potential issues before sending your emails, you can significantly improve the chances of your message reaching the inbox and engaging your audience.

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