The missing part for proper mail setup

This plugin serve a rather simple problem, that some of the SMTP plugin seem to miss (or hide behind huge PRO versions): When sending mails via services like Resend, system-generated emails lack a reply-to header, that will cause replies to end up being rejected, which if not, what I would expect as a user. WordPress however does not allow a reply-to header to be set by default.

Contrary to a simple PHP file with a filter, this plugins does not “hide” the setting from other admins. While it would be easy to setup something similar (although only as a reply-to fallback), such a file would be harder to find that a plugin with a proper title and proper entry in “settings”.

Still, the configuration is pretty detailed and allow setting up different addresses for different email types. Nice!