Silly question (?): Knowing that many mailing lists add [topic] at the beginning of the Subject line, what if DKIM was set to ignore that part when signing/verifying?
Would it help to solve the problem of broken signature thru mailing lists? I realize the issue would be to also detect the add footer, but if I recall you can specify in dkim to sign only a certain length of the body and not the whole body.
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