[Djigzo users] Not encrypt based on a specific header?

Is there a way to tell Cipher Mail to not encrypt based on a specific message header? I'm trying to fix the issue talked about here: http://www.symantec.com/business/support/index?page=content&id=TECH1946… I'm fine with the invites not being encrypted, but need a way to plug a rule in that says if this header: Content-Type: text/calendar; method=REQUEST; charset="utf-8" exists don't encrypt. Thanks! -- James Dasher <jdasher@pulseresearchers.org<mailto:jdasher@pulseresearchers.org>>