Forum Discussion
Unable to receive email on Office 365 through Barracuda
Same with the post here: https://answers.microsoft.com/en-us/msoffice/forum/all/unable-to-receive-email-on-office-365-through/b144e4db-e69f-470d-ac6a-e75d01a282fb but no definite answer to this. ...
surajbudhani
Microsoft
MicrosoftCan you check and confirm if this issue is with just a specific set of users or multiple users.
If its is with a specific set of users. Try sending a test email and check if internal emails work just fine. If Internal emails don't work check the email address and proxy address attributes.
If the issue is only with External emails in that case DBEB could possibly be blocking the emails. Try setting up the type of accepted domain from Authoritative to Internal Relay and test sending the emails and see if you get similar error.
If its is with a specific set of users. Try sending a test email and check if internal emails work just fine. If Internal emails don't work check the email address and proxy address attributes.
If the issue is only with External emails in that case DBEB could possibly be blocking the emails. Try setting up the type of accepted domain from Authoritative to Internal Relay and test sending the emails and see if you get similar error.