I do realize that this is very likely not a Piler issue but rather O365
related… but maybe somebody already came across this issue and knows how
to remediate it.
When I restore a deleted email in my O365 account, the message transfer
550 4.3.2 QUEUE.TransportAgent; message deleted by transport agent
The Piler server is setup as a connector in Exchange Online. The
Smarthost is <tenant-domain>.mail.protection.outlook.com.
Mails seem to be originating from
The error states that there is an NDR sent to that address, but even
after assigning that address to myself, no NDR is ever received.
I have set $config['REWRITE_MESSAGE_ID'] = 1;
Any help is greatly appreciated!