DKIM fails depending on Content-Transfer-Encoding

fi at igh.de fi at igh.de
Thu Sep 7 09:50:55 UTC 2023


Hello Raf, 

On 2023-09-07 10:31, raf via Mutt-users wrote:
> On Wed, Sep 06, 2023 at 01:33:30PM +0200, fi at igh.de wrote:
> 
> > Dear Mutt Users
> > 
> > recently I experienced DKIM fails that depend on the
> > Content-Transfer-Encoding of messages text part.
> > 
> > Being a german I use to write my messages in german with UTF-8
> > encoding. I prefer plain text. My e-mails are DKIM signed. I have
> > checked DKIM to be set up correctly twice.
> > 
> > By default Mutt does 8bit encoding for text/plain. Now I found that
> > several (most) of the recipient systems fail to check DKIM.

...
> Hi, This has come up recently in the Postfix mailing list.
> MTAs can convert 8bit messages when sending to another MTA
> that doesn't advertise that it can accept 8bit. If the DKIM
> signing happens before the conversion, then subsequent DKIM
> checks will fail. Work is being done in Postfix to address
> this. I don't know about other MTAs. It seems unlikely that
> there are any MTAs that can't accept 8bit messages, but perhaps
> there are some that are misconfigured and don't advertise the
> fact to other MTAs.

that's a good hint. I also suspected some MTA. So I should do further
investigation on them.




Best Regards

Torsten 


-- 
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Torsten Finke
fi at igh.de
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