[MM3-users] Handling of Mail from non-subscribers

Hi *,

I have a fresh setup of MM3 on Ubuntu 20, installed by apt-get. It seems to be running fine so far, except for some (to me) strange behaviour:

When posting to the list as a non-subscriber, I see the mail coming in on mailman's smtp.log, then it vanishes. No notice of this mail being hold is sent to the sender, no notice to the moderator, and logging into Postorius as owner of the list, it is not showing up in "Held messages"

"Hold for moderation" has been set.

Any idea how to debug this will be welcome - thank you :)

Best regards, Peter