I ran a top to see running processes and it looks like qmail. Though I thought qmail used sendmail somehow. Could be wrong though.... I'm okay with UNIX but only mostly for web server things. (Apache, MySQL, PHP...) I'm new to security and mail server testing/repair/hardening so I'm at a standstill. I made a few changes to the sendmail.cf file and one of the qmail files to throttle the connection rate and to pause 5 seconds before returning GREET. After switching Port 25 back on today the relays are no longer being passed on (I think...). My SMTP server is still being bombarded with connection requests so I'm not sure if I've completely resolved this or if I need to look elsewhere for connection restrictions. The connection attempt rate has, at times, approached 1.07 connections per second!