[Bug 1539390] Re: Alternative DMARC mitigation: Keep Headers

[Jakob Bohm]

I was not suggesting not doing policy/security filtering of posts.  If
such filtering changes a message, that message obviously cannot be
handled in "Keep Headers" mode and needs to fall back to one of the
other methods.

I was suggesting simply not doing the purely cosmetic message munging
where that munging would invalidate an enforced DKIM signature (or a PGP
signature if a poster uses that).  In other words, no suffix prefixing,
no reordering of "Re: " prefixes, no msg_header and no msg_footer.   For
many messages this would be enough to leave the message intact so it
passes signature validation.

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Title:
  Alternative DMARC mitigation: Keep Headers

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