Support Manager: New email support requests bounce after Blesta upgrade

[furioussnail]

Hello!
After upgrading Blesta to its latest version and running the upgrade script, new incoming support requests bounce with the standard message ("Our system received your email, but was unable to process it for one of the following reasons") with the subject header set to "Ticket:". The templates are the default ones. The attached image shows the config for the support department. Also, the logs reveal no issues even with debug mode enabled.
maillog: Sep 29 10:05:46 portal postfix/local[29136]: 638C3BB807: to=<support-blesta@portal.example.com>, orig_to=<support-blesta@support.example.com>, relay=local, delay=2.9, delays=0.02/0.02/0/2.8, dsn=2.0.0, status=sent (delivered to command: /usr/bin/php /blesta/index.php plugin/support_manager/ticket_pipe/index/1)
The pipe test creates a ticket successfully.
Any suggestions on how to fix this or at least debug further are highly appreciated.
Thank you!

[furioussnail]

Turns out it was an issue caused by how certain email servers or service providers set the "to" headers. I adjusted the department email address since my setup is a bit convoluted...