The system is IMail 7.14 with "no mail relay" checked and "disable smtp auth" UNchecked.
You actually helped us find the problem by removing the IP of your firewall:
20030326 142528 127.0.0.1 SMTPD (5E2B0038) [195.65.117.14] connect My.Fire.Wall.IP port 5502
20030326 142528 127.0.0.1 SMTPD (5E2B0038) [My.Fire.Wall.IP] EHLO namenn6iahca77
20030326 142528 127.0.0.1 SMTPD (5E2B0038) [My.Fire.Wall.IP] MAIL FROM: <[EMAIL PROTECTED]>
20030326 142528 127.0.0.1 SMTPD (5E2B0038) [My.Fire.Wall.IP] RCPT TO: <[EMAIL PROTECTED]>
20030326 142528 127.0.0.1 SMTPD (5E2B0038) [My.Fire.Wall.IP] RCPT TO: <[EMAIL PROTECTED]>
20030326 142528 127.0.0.1 SMTPD (5E2B0038) [My.Fire.Wall.IP] E:\Spool\Daa485e2b00388c2e.SMD 2499
Your firewall is acting as an SMTP server -- in almost all cases, this is a bad thing, and causes problems (or worse, it may be a "reverse firewall" that is protecting the Internet from you, but not protecting you from the Internet).
So spammers aren't connecting to your mailserver -- they are connecting to your firewall's mailserver, which is allowing them to spam! You'll need to either remove the firewall (which will improve security in this case, as far as mail is concerned), or fix it so that it doesn't interfere with SMTP, or get it to handle anti-relay.
-Scott
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