Timothy Jacobs

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.
Get the <a href="https://apps.apple.com/us/app/wp-mail-debugger/id1547093438?mt=12" rel="nofollow ugc">Mac App</a> to connect to multiple WordPress websites from one convenient location.

WP Mail Debugger

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.

This is so good

WP Mail Debugger captures and displays all emails sent through wp_mail() for debugging and troubleshooting.

barnz99

This plugin sets the PHPMailer Sender (return-path) the same as the From address if it’s not correctly set.
Mitigates the “via” and “The actual sender of” Notification in Outlook and stops email going to spam/junk because of the mismatch between From and Return-Path headers.
This usually occurs on shared hosting servers when local user / domain is used as default for the return-path header and WordPress only sets the From header.

wp_mail return-path

It still works and solves the issue it supposed to solve.

Working with WP 4.9.2

Simple plugin that correctly sets the return-path header when using wp_mail. Mitigates the "via" and "The actual sender of" Notif …

WP Mail Debugger vs wp_mail return-path