We have a problem with one confirmed user (and maybe 3-4 not confirmed)
Out of office reply is disabled but people are still getting resupplies back from that user. Reply goes back to external and to internal senders.
We have tried disabling it in outlook and in OWA, removed all the rules user had and the same message from a month ago still comes back.
The only thing that was done recently was the move of the mailbox to another server but I think it was done before user started having this problem.