Office 365 DL Relay Issues

New Contributor

I have a mail-enabled security group with users and contacts included.  When I send an email to them from internally, all members get the email without issue; however, when they respond or reply to the email, they are receiving an undeliverable error  "not authorized to relay messages".   The setting for delivery mgmt has "senders inside and outside of my organization" is checked.    Any thoughts?  Thank you.

4 Replies

Which server is generating that message? What does a message trace show?

@Vasil Michev 

 

See attached pic.  It's being blocked at O365 level.Capture.PNG

Post the full NDR message or the message trace details

We have found a workaround and have closed the issue.  Thank you. 


@Vasil Michev wrote:

Post the full NDR message or the message trace details



@Vasil Michev