Configure wildcard catch-all email with Postfix

Question

I have a setup using Postfix with a MySQL database to configure domains, accounts and aliases.

I can set up a catch-all address when using a @example.com mail and forward it to account@example.com.

Now I want a more advanced catch-all, like user-%@example.com to forward all to alice@example.com and prod-%@example.com forward to bob@example.com. % should be any alpha-numeric letter combination like user-1@example.com or prod-asdf@example.com.

Is this possible or do I need to change my setup?

Answer 1

Seems feasible enough with slight effort; Postfix supports random user-created aliases via the recipient_delimiter configuration directive, so you could set recipient_delimiter = - and create user@example.com as an alias to alice@example.com, and user-%@example.com would resolve first via recipient_delimiter to user@example.com, and from there via the alias map to alice@example.com. (If you already have email addresses containing dashes in your domain, you'll need to choose a different delimiter, or those addresses will stop working.)