Forum Discussion
Internal emails being treated as external emails
We have Exchange Online only - We have an application that sends out emails to users within the company however we have found an issue where all our distribution group recipients aren't getting the ...
JackBarlow224 I don't understand this bit "The email that's sending the mail is an internal Distribution group email which routes through an authorized connector"
DL's or groups by themselves can't send messages. Is the application sending the email to a DL? Is the application on-premises and using an EXO connector for message relaying?
The application sends the mail as this DL to other DL's and personal mailboxes (however the issue effects any application that sends emails to DL's)
The application is not on prem, we are fully cloud based but It is using an EXO connector.
However, it's since we added the EXO connector, these emails are being marked as "outside organization" but the IP's the mail is being sent from is authorized in the connector so I am at a bit of a loss on what's happened.
- I assume you're using Option 3 from the below:
https://learn.microsoft.com/en-gb/Exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365?redirectSourcePath=%252farticle%252fHow-to-set-up-a-multifunction-device-or-application-to-send-email-using-Office-365-69f58e99-c550-4274-ad18-c805d654b4c4
