We are seeing massive amounts of the following errors pile up in our mail queues.
"452 4.5.3 Too many recipients (AS780090)"
This happens even when there is only 2 or 3 recipients. I think there may be a network issue at MS hosted email.
https://lists.ausnog.net/pipermail/ausnog/2023-October/threa...
https://www.reddit.com/r/sysadmin/comments/1755npg/anyone_el...