I just inherited a couple of SMTP gateways running postfix and spamassassin. We are seeing a huge increase in these emails with 'Re:[]' over the last couple of weeks. One thing I've noticed is that in the headers of these emails they contain the line 'X-SA-Do-Not-Rej: Yes'. From everything I've read this is a string that is used with Exim/SpamAssassin configurations. Can anyone tell me if this might be causing these spam messages to get through on our Postfix/SpamAssassin servers. It appears that these messages are completely bypassing the spamassassin scans because no additional spamassassin tags are being added to the headers. From the content these should easily be scoring a 20+ from the standard SA rules.
-- Brian
