Yes, we have a PF gateway on the front end. I thought of that originally but PF doesn't do anything to modify messages that get past it's basic blocking.
Are you positive? I've seen PF modify E-mail headers, such as adding a Message-ID: or Date: header if one isn't present in the original E-mail (things that are good once the E-mail is ready to be delivered, but can prevent programs from scanning the original E-mail properly).
-Scott
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