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BillKnox-5462 avatar image
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BillKnox-5462 asked BillKnox-5462 commented

Add proxy email addresses automatically

In On-Prem Exchange, you could set email address policies to automatically configure a number of email addresses on email box creation (jdoe@conteso.com, john.doe@conteso.com, john@alternateconteso.com, ect). Is there a way to still do this in Office 365 that is Azure AD synced, with all users updated from AD?

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@BillKnox-5462

I am writing here to confirm with you any update about this thread now?
If the suggestion below helps, please be free to mark it as an answer for helping more people.

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michev avatar image
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michev answered michev commented

Only for Microsoft 365 Groups, as email address policies in Exchange Online don't support other recipient types. You can always use PowerShell though.
The above applies to cloud-created objects though. If you are syncing from on-premises AD, any changes, including those to email addresses, need to be authored on-prem.

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Michev,
Appreciate the answers; however, I think only the third sentence applies. The questions was, "Is there a way to still do this in Office 365 that is Azure AD synced, with all users updated from AD?"
If I understand your answer correctly, any changed to proxy email address would need to be handled on-prem (at the DC most likely).
So there is no method similar to the exchange rules to handle multiple proxy addresses automatically/on user creation?

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michev avatar image michev BillKnox-5462 ·

No. Even if there was such method, the fact that you are syncing from on-premises AD means that changes need to be authored there.
The only workaround is to use the -WindowsEmailAddress parameter, which "bypasses" the restrictions. Here's an example:

 Set-Mailbox user -WindowsEmailAddress new@domain.com

This will add new@domain.com as the primary SMTP address, while keeping the existing one as secondary. You can run it multiple times to add additional aliases as needed, even for synced users. However, changes you make directly in O365 can potentially be overridden by dirsync, so it's best you add the addresses on-premises.

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KyleXu-MSFT avatar image
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KyleXu-MSFT answered BillKnox-5462 commented

@BillKnox-5462

I wan to confirm with that:

  1. How do you created mailboxes in your organization?

  2. Whether there exist hybrid in your organization?

If those Exchange online mailboxes are created in the way of "remote mailbox", you could create Email Address policy on Exchange on-premises. It will apply on those mailboxes, then sync to Exchange online side.

If those Exchange online mailboxes are created in the way of "assign license" and there exist hybrid in your organization, you will could enable remote mailboxes for those mailbox from Exchange on-premises, then you will could manage those mailboxes from Exchange on-premise with Email address policy.

If there doesn't exist hybrid in you organization, you just sync AD accounts to AAD, then assign license to enable those mailboxes. You will cannot add proxy email on those Exchange online automatically.

In short, if there exist hybrid, you will could change those Exchange online mailboxes to remote mailboxes, then manage them from Exchange on-premises. There doesn't exist Email address policy for Exchange online mailbox, but in a hybrid mode you to manage them from Exchange on-premises.


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KyleXu-MSFT,

By license through O365
There is no hybrid environment

Thank you for the help, all, it seems there is no good way to automatically accomplish the task.

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