Starting a new thread because I don't know how to reply to this one from November 2021:
https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/message/...
A subscriber's post to a list bounced with a 501 bad encoding error. The subscriber uses Apple Mail on MacOS and PGP-signed his message.
The earlier post above suggests the problem could be a bug in either Apple Mail encoding or python's smtp module.
To rule out the smtp module, I sent a PGP-signed message using a different MUA (Thunderbird, in my case). Mailman3 accepted this post without complaint, and I reported back to list users that this appears to be an Apple Mail encoding issue.
Normally, that'd be the end of it. But this is a list for a bunch of Internet graybeards, including one of the authors of the SMTP protocols and the subscriber is a former IETF chair. He's grumbling that if this really were an Apple Mail issue, wouldn't it be far more widespread?
I don't think it would be, because (a) Mailman2 is still far more pervasive than Mailman3 and (b) the combination of PGP signing and Apple Mail on MacOS and Mailman3 is still pretty unusual.
Has anyone else hit this encoding issue, other than the post above? And did Mailman2 silently accept this because it was less strict about checking for bad encoding?
Thanks.
dn