I have a problem with mailman after upgrading ISPconfig to the current stable release. Everything worked fine before the update. After the update the following problem exists.
"error while sending message: mail server response: 5.1.1 <email@example.com>: Recipient address rejected: User unknown in virtual mailbox table. Please check firstname.lastname@example.org
I studied the forums for hours but I didn't found a solution. I send some configs I someone has an idea. Would be awesome to get some replies.