+# blarson 2009-04-09
+# if we can't use Ironport as spam sign, at least don't treat it as non-spam
+bayes_ignore_header X-IronPort-Anti-Spam-Filtered
+bayes_ignore_header X-IronPort-Anti-Spam-Result
+bayes_ignore_header X-IronPort-AV
+# blarson 2009-05-22 google spam
+bayes_ignore_header DKIM-Signature
+bayes_ignore_header DomainKey-Signature
+# blarson 2010-02-23
+bayes_ignore_header X-Greylist
+