Ian Kelling <[email protected]> wrote: > Dmitry Alexandrov <[email protected]> writes: >> It’ve just got the following message where ‘From’ is rewritten: > > This happens very rarely and its due to misconfigured email servers which > send us bad dkim signatures, including bad in the case that they include > nonexistent list-* headers in their list of signed headers, which should > never be done.
Yes, indeed. Though, unfortunately, there is a header, that is fully legitimate for a user to set (and sign), but is rather abused by Mailman — thatʼs ‘Sender’. Neither Majordomo nor public-inbox do that, why Mailman is so peculiar, I wonder. > In this case, the dkim signature failed to verify when it got to our server, > so we had to rewrite it. > > 2019-10-31 12:45:26.710 [1437] 1iQDZe-0000NB-Mc DKIM: d=opengroupware.ch > s=dkim20160331 c=relaxed/relaxed a=rsa-sha256 b=4096 t=1572539476 > x=1574353877 [verification failed - signature did not verify (headers > probably modified in transit)] > > I'm planning to implement an autoreply in such cases to let the posters know > to fix their mail server. In the light that opengroupware.ch is <https://kolabnow.com>, which is commercial email service provider, that looks funny. It might even be a good idea to contact them, rather than user. In any case, thank you for taking the time to explain.
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