Sendmail Weirdness on 6.2 (Duplicate Emails)

[Tom Grove]

It seems as though something in my setup or in Sendmail 8.13.8 is 
causing certain domains, namely Hotmail, to keep sending messages over 
and over up to 15 times.  Each message is accepted and sent to the 
user.  The MX is just a machine that has 6.2, spamassassin, clamav, 
milter-regex and some dnsbl stuff.  It then relays mail to the imap/pop 
server for user retrieval.  I have no idea what could be going on here.

Anyone else had similar issues?

-Tom