Hi everyone,

we also have the same or at least a similar problem. However not with every 
mail but with most. We were so far also unable to find the root cause for this 
and can't see any distinctive differences between mails that fail to restore 
and those that don't. In our specific setup piler is using a postfix server as 
smart host which then redirects the messages to exchange online via a transport 
rule. EXO accepts the restored messages our postfix sends but never delivers 
them to the inbox.
Looking at the message trace in EXO shows that the message is beeing recived 
but there are no detailed trace infos available.

Out first guess was also that EXO doesn't like recveiving messages with the 
same message ID multiple times. We haven't tried REWRITE_MESSAGE_ID yet but 
based on what Alex wrote this seems to not solve the problem.

Von: Karl Rossing <karl.ross...@gmail.com>
Gesendet: Freitag, 16. April 2021 17:54
An: Piler User
Betreff: Re: Restore to O365 fails

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<mailto: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 

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 

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!


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