Paul Dulaba wrote: > As far as I know, SpamAssassin does. Ahh.. Yes it does.. Nevermind..
That said, the presence of that header doesn't really mean much. SA only adds that when it tags. If another SA instance did the tagging, your site would not have modified X-Spam-Prev-Subject. However, the difference in tags is significant. However, I would check the Received: path in great detail to make sure the message didn't do something like go through a secondary MX that scanned with SA prior to sending to the primary MX, or other weirdness.
