Hello - we are seeing a lot of this happening:
we host somedomain.com, with users x, y, and z
we are seeing a large amount of directory harvesting going on, and a lot of e-mail trying to go to firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, etc., etc.
obviousely, there are no accounts there, but zimbra is still trying to process the mail, and is sending mailer-daemon replies to the senders of those e-mails.
now, is there a way to set zimbra to black-hole any e-mail whose intended recipient does not exist on the server (on incoming mail only obviously).
if so, how can I set this?