> On 21 Oct 2024, at 14:33, Florian Effenberger via mailop <mailop@mailop.org>
>
> thanks to a friendly reader of this list, I tested the mail also with
> aboutmy.email.
>
> I can confirm now that when the Content-Encoding is 8bit, it gets bounced by
> Mimecast, and also flagged as erroneus by aboutmy.email. When I switch to
> Quote-Printable, the mail passes both just fine.
If you’re sending 8BITMIME payloads to aboutmy.email that’s probably your
problem. We don’t currently advertise 8BITMIME, and flag any non-ascii
character in the transaction as a problem.
A lot of MXs advertise 8BITMIME, and many others will accept non-ascii payloads
even if they don’t, so violating it is a fairly common mistake that doesn’t get
noticed right away.
But at that point you’re not sending email, so you’re outside the scope of what
DKIM promises to do.
Cheers,
Steve
>
> As I consider my setup pretty standard, and I don't modify the e-mail, I
> wonder if this is a bug in rspamd, in Mimecast, or in the connection of these
> two...
>
> Florian
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