I'm hosting mail for a domain for my own use and a small number of other users.
I have set myself up to be the catchall address and this works fine.
However I would also like to 550 reject a few addresses that receive nothing but spam. How could I achieve this?
If a 550 reject is not easily possible I would like to bounce emails to these addresses or send them to /dev/null rather than into my mailbox via the catchall.