If you run postfix you can have that even easier; look for smtpd_recipient_restrictions and check_recipient_access in 'man 5 postconf'. I'm running with this r

If you run postfix you can have that even easier; look for smtpd_recipient_restrictions and check_recipient_access in 'man 5 postconf'. I'm running with this rule in the access map: /^from-.*@foobar.com$/ OK That accepts all mail to an address prefixed with "from-" and (by default) rejects everything else. This way you can just make up the dummy-addresses on the fly. I remember being slightly worried about using such a simple prefix when setting it up initially. However I have never received mail to a from-* address that I didn't "create". Not once in over 6 years. And disabling an address that has turned spammy is as easy as: /^from-stuffit-expander@foobar.com$/ 554 No thanks.