Nick Howitt wrote:

AKAIK it does go through spamassassin, but none of the RBL lists will work as they all look up the ClearSDN server IP's.

Nick, I figured out something that might help others. (Perhaps this is also stupid rule as other valid senders might use this, but I haven't found any using this form in the past month's logs.)

I put the following in the Spamassassin blacklist and now i'm spam free from those people stuffing the MX backup. I noticed that they always have the same form in the logs:

Following put in the Spamassassin blacklist:


So far in the past 3 days, it's caught and gotten rid of 1200+ spam. It's a shame for the wasted processing and bandwidth but my email client is clean for the first time in weeks.

Maybe this should be cross posted to the forum dealing with Spamassassin?