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 always fails:

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 MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@<tenant>.onmicrosoft.com

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!


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