Florian Effenberger via mailop skrev den 2024-10-21 15:28:
Hello,
Florian Effenberger via mailop wrote on 21.10.24 at 10:33:
I just sent an e-mail to the affected domain, Bcc my GMail address.
For that very mail, GMail confirms the DKIM signature is proper,
whereas Mimecast bounces it.
The only two options left are that Mimecast has hiccups with my DNS
setup (which would be strange, as all major providers work flawless
with it, and they seem to be able to load the SPF records from that
very DNS), or stumbles over something else in my rspamd configuration
(which would be strange as well, because that is pretty much a
standard setup).
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.
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...
possible 8bitmime is it then
avoid using qp encoding since it hiddes real problems
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