WP Mail Debugger


WP Mail Debugger captures and displays all emails sent through wp_mail() for debugging and troubleshooting. A new admin menu, WP Mail Debugger, is added under the Tools menu.

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11 September 2020
I “found” this plugin when its creator presented it at WCPhx 2020. Its extremely easy to use, and is helpful in a day and age when SPFF and DKIM issues make debugging mail tough. Show your users the mail is going out. Or as a plugin developer, use it to review output.
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Contributors & Developers

“WP Mail Debugger” is open source software. The following people have contributed to this plugin.


“WP Mail Debugger” has been translated into 1 locale. Thank you to the translators for their contributions.

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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • New Feature: If an email fails to send, the error messages will be displayed on the email detail screen.
  • New Feature: Easily resend a message from the email detail screen. You can even specify a new recipient address if needed. This feature is only available when in “Filter” mode.
  • Bug Fix: Compatibility with WordPress 6.6.


  • Add: Enhanced multisite support. A new network admin page shows emails across the entire network.
  • Tweak: Links in emails open in a new tab.
  • Bug Fix: Account for CSS changes to WordPress components.


  • Initial release.