We have 2 major problems & a few small concerns. 1) Last week one of our server IPs ended up on http://www.rfc-ignorant.org/ spam list. We were able to get it removed quickly but as of today we have clients complaining that they can not send out emails due to spamcop.net blocking the email. Our main server IP seems to now have been listed on spamcop.net. My questions are, a. How can I find out what is causing this to happen? b. What can we do to protect our server IPs from being listed? & c. How do I find out who is reporting our IPs? 2) For the past few months our mail queue has been filled with emails such as the below. Now it is great that the server is not letting the original emails though but can I turn the below reply email off? Chances are the original emails are from an evil person anyway & we do not care to send any reply if an attachment with an invalid extension is trying to pass through our server. 1BNHG5-0001W6-9I-D This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: email@example.com This message has been rejected because it has a potentially executable attachment "material.scr" This form of attachment has been used by recent viruses or other malware. If you meant to send this file then please package it up as a zip file and resend it. 3) Has anyone been able to put a stop to the real email addys being spoofed? 4) We are considering adding a spam & virus software to our mail server. Any suggestions that work well with little maintenance? Thanks in advance for your help!