[MM3-users] Problems with signed messages from Apple Mail

Rainer Herbst writes:

after upgrading his Mac to MacOS 12.0.1 Monterey, one of our users can not send send signed messages to lists using Apple Mail v. 15.0 (3693.20.0.1.32).

Apple Mail is a not a good Internet citizen, not particularly friendly to recipients whose software depends on standards conformance. It doesn't surprise me that Mailman considers its output broken.

Aside from what Mark suggests to investigate on your side, you could also have the user send a "This is a test message", redact any identifying information such as domains, mailboxes, and IPs, and post it in an issue to https://gitlab.com/mailman/mailman/.

Steve