Forum Discussion
EXO: 550 5.4.1 Recipient address rejected: Access denied to Distribution List (Only newer ones)
Hi all, I have set up a DistributionGroup so that it can also receive external emails. If I test it from different (external) tenants I get the following error message: 550 5.4.1 Recipient a...
If you are not getting any results in the message trace and it works when switching to InternalRelay, this is most likely caused by issue with the Directory Based Edge Blocking feature. You can try to trigger the replication by changing the primary SMTP address of the DG (and changing it back if needed), or you can open a support case and have the engineer look at it.