[MM3-users] Changing Mailman's "from" domain - redux

(this is a posting directly into this web ui as mails to this list just vanish without a trace)

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Anyone? Anyone? With reference to the original mail here https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/P...

It seems that the "From" domain field is set by Postorius, but I can't find anything in its documentation on how to change it.

I've done obvious things like change the boxes hostname to what I want, have fiddled around in the various Postfix settings for mydomain, etc etc. But all admin messages, listserver replies etc come from the partial domain "blah.blah", not "listman.blah.blah".

Any ideas welcome.