A customer has told me that he accidentally signed up for something with his real email when he shouldn't have and now wants to bounce email based on who it's from. He doesn't want it blocked by spamassassin, he wants it bounced. Any ideas on how to generate a bounce email ("There is no such address kind of stuff) based on who the email comes from?

If your using cPanel you can setup email filters in cpanel which can be set to do this. I would just have the mail deleted though and not even bother with a no such address. That will just overload your server in time...

Yeah, that's what I tried to tell him, but he's a dedicated server customer.. guess if he wants to overload it he can :)

Well if the customer has qmail they could use the badmailfrom list. Qmail has a file that you can put email addresses/domains in and if it matches it will bounce back a message to the from address stating along the lines they are on his block list.

Silly