Custom return path (bounce) address VS Monitored Inbox Settings

Your software
Mautic version is: 4.4.5
My PHP version is : 7.4.33
My MariaDB version is : 10.5.17-MariaDB-cll-lve

Your problem

I have a problem with the bounce management.

I did everything as it was said here: Bounce management | Mautic and read so many posts about bounce management but haven’t found the answer.

Can someone help?

I am sending and receiving emails via my own server. Sending emails works perfect. Problem is with receiving bounces.

If I set a Custom return path (bounce) address with my email address bounce@domain.com in the Email settings than all bounced emails are sent right there to bounce@domain.com. It’s ok. But if I additionally set this email address (bounce@domain.com) in the Monitored Inbox Settings as well, my mailbox bounce@domain.com does not receive bounced emails any more.

I checked my server logs and found that every time it is a bounced email the delivery of the returning message is false. Every time it happens it tries to send returning message to the email address bounce+bounceXXXXXXXX@domain.com instead of bounce@domain.com.

See below an example log how it looks when I’m sending an email from Mautic (configured to send emails from address mail@domain.com) to the fake email address abcdefgh123@ffaakkee.com.

Be aware that even if I’ve configured (in the Email Settings) that Mautic should send email as mail@domain.com it makes the bounce+bounceXXXXXXXX@domain.com email address as the sender!

2022-12-23 02:13:42 1p8Wd4-000Cd7-8b <= bounce+bounce_63a500c627b54794432230@domain.comA=login:mail@domain.com … from bounce+bounce_63a500c627b54794432230@domain.com for abcdefgh123@ffaakkee.com

2022-12-23 02:13:42 1p8Wd4-000Cd7-8b ** abcdefgh123@ffaakkee.com F=<bounce+bounce_63a500c627b54794432230@domain.com >: Unrouteable address

2022-12-23 02:13:42 1p8Wd4-000Cd7-8b Completed

+++ 1p8Wd4-000CdF-Aa has not completed +++

2022-12-23 02:13:42 1p8Wd4-000CdF-Aa <= <> R=1p8Wd4-000Cd7-8b U=mail P=local S=32763 T=“Mail delivery failed: returning message to sender” from <> for bounce+bounce_63a500c627b54794432230@domain.com

2022-12-23 02:13:42 1p8Wd4-000CdF-Aa ** bounce+bounce_63a500c627b54794432230@domain.com F=<> R=virtual_aliases:

2022-12-23 02:13:42 1p8Wd4-000CdF-Aa Frozen (delivery error message)

Is there any way to make Mautic send email as mail@domain.com and if the email is bounced make the message return to the bounce@domain.com address instead of bounce+bounceXXXXXXXX@domain.com?

Any help would be most appreciated.

All the best.

Greg