Catch all??

[Lboc]

I have my catch-all option set to return all e-mail with an unknown e-mail sender from my xx.com account. For some reason, lately I have seen several of these type e-mails slip through to my mailbox at zz@xx.com. My question is: What other step(s) might I take to cause the sender of this unwanted message to have it immediately bounced back to them rather than ending up marked as "SPAM" and still ending up in my mail account.

[floyd]

I have my catch-all option set to return all e-mail with an unknown e-mail sender

How did you do that and what do you mean by "unknown e-mail sender?" Unknown to who?