We deployed a brand new server today but to our surprise, we have encountered issues with email aliases not working. The mailboxes work however when someone sends an email to an alias, it gets a bounce back saying "user unknown"
When looking in the logs, I find this:
Feb 10 19:10:30 NT-MAIL01 postfix/pipe: 562692214AD: to=<email@example.com>, relay=maildrop, delay=0.2, delays=0.1/0/0/0.09, dsn=5.1.1, status=bounced (user unknown. Command output: Invalid user specified. )
Why isn't this working?