FlexMailer: Default Return Path not respected
In Administer » CiviMail » Mail Accounts, you can specify a default return path for your CiviMail mailings. This is important when, for instance, your bounce address's mailhost does not support VERP. This forces the Return-Path
header to a specific email address. The bounce processing code will find the X-CiviMail-Bounce
header and process that instead of the bounce address.
However, this functionality was not ported to Flexmailer. You can see it at the very top of CRM_Utils_Mail::send()
but not in Civi\FlexMailer\Listener\BounceTracker::onCompose()
.
This causes the return-path to have the VERP address.