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Office 365 Groups with additional Email Addresses and DBEB (internal Relay Domain / authoritative Domain)

Thorsten_S
Thorsten_S asked
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Last Modified: 2017-05-09
Hello,
I have a problem with a Office 365 Group. This Group has one primary E-Mail address (groupname1@contoso.com) and E-Mails can be send from external senders to this Group. When we add additional E-Mail addresses to this Office 365 Group (groupname2@contoso.com) and external senders are trying to send E-mails to that address it does not work.

When I go to Exchange Online Admin Center and change my accepted Mail Domain from "authoritative" to "internal relay" it is working. The additional E-Mail addresses are now working from extern. By doing this I deactivate DBEB (Directory Based Edge Blocking). DBEB is only active when my domain is "authoritative".
When I understand everything right, the additional E-Mail addresses are not synced to EOP (Exchange Online Protection) and because of that the E-Mails are unknown for my Maildomain and the mails to the additional E-Mail addresses are blocked.

Is there a solution for that problem?
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Commented:
Hello Michev,
thanks for your quick reply. So when I understand it correct I have to configure every mail alias step by step as primary. After that procedure I can change the primary mail address back to the initial mail address and all alias addresses were synced to EOP and will remain there?
CERTIFIED EXPERT
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Distinguished Expert 2019

Commented:
Yup, and wait few minutes between the changes to give it a chance to sync.

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