https://bugs.exim.org/show_bug.cgi?id=2295
--- Comment #3 from Guillaume Outters <guillaume-exim@???> ---
Oh, you're right. I rechecked my old e-mails: the problem does not lies in the
header hash being computed with a ";", but in this being inconsistent with the
final DKIM-Signature.
On the different versions I ran on my e-mail server:
4.82:
hash computed with b=;
emitted DKIM-Signature: v=1; â¦; b=<signature>;
-> valid signature (hash computing base and emitted header being consistent)
4.89 and 4.90:
hash computed with b=;
emitted DKIM-Signature: v=1; â¦; b=<signature>
-> invalid signature (inconsistent, hash computed with a final ;, header
emitted with no ;)
my modified 4.90:
hash computed with b=
emitted DKIM-Signature: v=1; â¦; b=<signature>
-> valid signature (consistent on no ; at the end)
So another way of making it work may be restoring the ; at the end of the
emitted DKIM-Signature header, to make it consistent with the input of the
header hash.
What puzzles me is that the 4.91 of the exim-dev mailing list has those ; at
the end (so they validate).
So maybe it is a misconfiguration in my exim install? Something like a filter
who would normalize headers by suppressing final semicolons. I will try to
narrow the problem.
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