Mailer daemon messages are not sent outside of chatmail servers

[link2xt]

Users on nine.testrun.org report that they have a group where attempting to send results in error "5.1.1 ... User does not exist" for some nine.testrun.org users. But users sending from chatmail.woodpeckersnest.space do not see this error. They should get a bounce message, but it seems bounce message originates on nine.testrun.org but rejected by filtermail because it is not encrypted, so it is essentially not sent.

[hpk42]

On Sun, Dec 22, 2024 at 13:46 -0800, l wrote: Users on nine.testrun.org report that they have a group where attempting to send results in error "5.1.1 ... User does not exist" for some nine.testrun.org users. But users sending from chatmail.woodpeckersnest.space do not see this error. They should get a bounce message, but it seems bounce message originates on nine.testrun.org and then rejected by chatmail.woodpeckersnest.space because it is not encrypted.

but chatmail servers typically accept incoming unencrypted mails, so why would woodpeckers reject a mailer daemon from nine?

[link2xt]

The message has already been edited, when you read GH emails you only get the first version.