Rewriting is a common cause of breaking DKIM signatures. There is a
plethora of cases where they fail anyway, but in this case the message
was a plain text message in us-ascii, so it's quite difficult to
understand why signatures have been broken.
My understanding is that the message was rewritten because it missed
an explicit "Content-Transfer-Encoding: 7bit". I see two ways of
fixing this with one liners:
* In submit2.c, MessageEnd, ~981: don't rewrite the message if there
are no serious reasons to do it. This is the most DKIM-friendly
change.
if (rfc2045_ac_check(rwrfcptr, rwmode))
dorewrite=mime? 1: 0;
* In rfc2045acchk.c, rfc2045_ac_check, ~71: if the message misses a
C-T-E field but doesn't actually need one, don't rewrite it. This
is the most case-specific change.
if (RFC2045_ISMIME1DEF(p->mime_version)
&& !p->content_transfer_encoding
&& hasnon7bit)
and later, ~102, check again...
te=p->content_transfer_encoding;
is8bitte=te && strcasecmp(te, "base64") &&
(All snippets terminate with the changed line.)
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