Forum Discussion

Copper Contributor

Sep 18, 2017

Office 365 group to receive external email

Hello all, Lately I have been running into an issue with trying to email to an Office 365 group with an external email address. Even with the group having external email enabled, none of the emai...

microsoft 365 groups

Copper Contributor

Sep 18, 2017

This has been an issue from the start. We are trying to have this work and unable to do so. I am not sure that other steps have taken place to ensure external emails can send to Office 365 groups.

MVP

Sep 18, 2017

I think you need to follow your mail through to figure out what's happening. If you use Mail trace in exchange, find messages heading to that address and see what's happening to them.

Tim Ihrig
Copper Contributor
Sep 18, 2017
When i look into Message trace on our Ironport I do see that the message was delievered. However when I look on message trace I do not see that anything came through. Is there something specific that needs to happen with Azure such as write back?
- Steven Collier
  MVP
  Sep 18, 2017
  If you aren't seeing the messages at all in the Exchange Online message trace then they are being blocked elsewhere. Sounds like that IronPort might be up to something, surely it should tell you what it does with the message it receives?
  - Tim Ihrig
    Copper Contributor
    Sep 18, 2017
    Hi Steve. My IronPort is telling me that the message is queued for delivery. I believe that this is a mail flow issue. Comes in externally, hits IronPort and then once it hits exchange online, it is not routing correclty to on-prem. In my Delivery scop options for outbound to office 365 within EAC I am seeing there is only domain@mail.onmicrosoft.com there. I am going to attempt to add domain@onmicrosoft.com along with routing mail through smart host, to see if this makes a difference.