Problem solved! Firstly, a correction to my original post. The file `/etc/postfix/virtual_mailboxes` should have had an aditional line, as follows:
> == /etc/postfix/virtual_mailboxes == > al...@example.com example.com/alice/ > b...@example.com example.com/bob/ > catch...@example.com example.com/catchall/ # Previously missing line Now, the problem was solved by specifying the catch-all address not as an alias in `/etc/postfix/virtual_aliases`, but instead as a mailbox in `/etc/postfix/virtual_mailboxes`, as follows: > == /etc/postfix/virtual_mailboxes == > al...@example.com example.com/alice/ > b...@example.com example.com/bob/ > # Catch-all mailbox belongs to user `catch...@example.com` > @example.com example.com/catchall/ # Adjusted this line > == /etc/postfix/virtual_aliases == > postmas...@example.com al...@example.com That is, the superfluous aliases `al...@example.com al...@example.com` and `b...@example.com b...@example.com` no longer need to be specified, and the mailbox resides at `/var/mail/virtual/example.com/catchall`, which I require in order for my POP3/IMAP server (Dovecot) to fetch a user's mail based on which username they log in with. Thus, if a user logs in as `catch...@example.com`, they can now see mail that has landed in the catch-all mailbox. -- Jivan
