Are you using system users or virtual users in your system? /etc/aliases are for system users in the system. You may be looking for virtual_alias_maps instead?
-----Original Message----- From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of James Dore Sent: Thursday, October 26, 2017 10:17 AM To: postfix-us...@cloud9.net Subject: Postfix, mailman, and aliases problem Hi list, I recently migrated our mailman server from an old SLES 11 box to Ubuntu 16.04.3 LTS, and installed Mailman from the Ubuntu repositories along with Postfix and other prerequisites. Mailman itself is working fine, but I have a handful of regular email aliases in /etc/aliases which do not receive mail, and when examining the logs, get bounced with a “User unknown” error. What did I screw up? (I’ve checked my aliases and they’re good, and I’ve run the newaliases command numerous times). Cheers, James -- James Dore, IT Officer, New College Oxford