Feb 28 2019 12:41 PM
Hi,
I am currently troubleshooting an issue for my client in regards to message moderation. The current set up is an Exchange 2013 Hybrid solution and they have a mail flow rule set up for sending all mails containing a zip file to a mailbox for approval. This was working fine until the mailbox was migrated to Exchange Online. Now the e-mails sent for approval are failing with the following error Reason: [{LED=550 5.2.0 Resolver.MT.ModerationLoop; Loop in approval process};{MSG=};{FQDN=};{IP=};{LRT=}].
If I recreate the mail flow rule then I get the same issue and if I turn off moderation, then the mail gets delivered without the moderation option.
I've run out of ideas on how to resolve this issue, so I am turning to my peers in the community for help please.
Rgds Lee
Mar 02 2019 11:39 AM
Mar 04 2019 02:34 AM
Hi Brian,
Thanks for the reply, The mailbox was the target one for approval. There were rules on both on-prem and exchange online.
I fixed the issue by enabling TNEF on the remote domains and turning off Moderation on the mailbox. I added the onmicrosoft.com address to the outbound to O365 send connector and the decision buttons appeared. I then had to create contacts for the on-prem arbitration mailboxes as the accepted domains are authoritative and they weren't synched by AAD Connect. The approval now works although it send two messages.
Rgds
Lee