Bombarded With Spam

[Kirk Bocek]

I inadvertently set open relay on my server sometime ago. I've fixed it 
but I am now bombarded with spam messages. I'm seeing messages like:

6C5C41FCB3     5940 Sun Sep 24 11:10:12  bdnqkqhakis...@sfilc.com
(delivery temporarily suspended: lost connection with 
mx-tw.mail.gm0.yahoodns.net[27.123.206.55] while sending RCPT TO)

That fill up my mailq. I've since blocked sflic.com but I get others 
with a gmail.com domain.

How do I block or reject these messages?