I'm glad I'm not the only one having
rejections.  I noticed a resend
 tends to get it onto the list, which seems like a bogus filter (He's a
 spammer, DENY!... Um, he sent it again, I guess not, let it
 through...:-)
  
Jim,
My understanding on this is that the filter is based on IP address so if your provider has
a server name for their SMTP that maps to a number of IPs some could be blocked while
others are not. Today, I must be on a "clean" IP!
-Ali