We have had the same problem. I meant to open a ticket with Microsoft but so far have not.
On Fri, Apr 16, 2021 at 8:53 AM Alexander Noack <a...@loetzimmer.de> wrote: > 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 > <http://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! > > > Alex >