Hello everyone,
let me thank you again for helping me out with this issue, I am really
glad to see so much discussion and support here!
Now things seem to fall into place indeed. Both Mimecast as well as
aboutmy.email do not announce 8BITMIME, while other sites for testing
like dmarctester or dkimvalidator support it. I just checked that for
all these MX.
That seems to explain why the signature works correctly for nearly
everywhere, except for these two sites (and I actually appreciate
aboutmy.email's settings, because that helped to identify the problem!).
Exactly as Alexander described.
I was briefly confused with SMTPUTF8, but the issue is actually 8BITMIME.
On another host I have access to (but did not setup myself) with amavis
I do not have that problem, so it seems the message gets converted
before signing, whereas in my setup with rspamd it does not.
D'oh...
I'll try to look for a solution now. What Jaroslaw proposed seems to be
an option, alternatively a newer Postfix version that supports
force_mime_input_conversion. Happy to hear about other solutions if
people have something in mind, of course. ;)
Thanks everyone!
Florian
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