Right, so i went into the Outlook of the Shared Mailbox that sent the emails, i can see they had a body but 4-10 MB of 5-8 attachments, and both a long chain of email. My admin UI attachment limit is 14MB and all file types were authorised.
I re-forwarded an email corresponding to the most recent of the 2 emails, reducing number of attachments, that worked quickly.
Now i shall clear mailq
cd /var/discourse
.\launcher enter mail-receiver
mailq
11306 Kilobytes in 2 Requests is still there
so i run
postsuper -d ALL
and get
postsuper: Deleted: 2 messages
run mailq agin for sanity, find that it’s empty
exit,cd, then logout