Are you talking about the ?B? or the ?Q?But I've found also several legit cases where the e-mail client has base64 encoded the entire subject line or also only the word that contains a special character. (Some of them was send from a hotmail account).
I don't check for ?Q?, but this would be problematic if it happened with ?B?. I've been failing on that filter alone for months now without any FP's. Of course, all of my customers are from the US and they tend to get very little foreign E-mail, and nothing legit that is in any other language. This may be why it is safe on my server. I would though reduce the scoring if you confirmed the issues with ?B?, it just wasn't perfectly clear from what I read. It seems that you are saying that a high-bit character, even though it might be standard Latin-1, will cause some mail clients to base64 encode the subject. If so, it would seem that this is only necessary to mail clients that only support 7 bit characters in the subject, or possibly the result of bad programming, or non-English versions of mail programs?
Please let me know.
Thanks,
Matt
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