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user UPN is different from EMail address

    Question

  • We have Exchange 2010 in Windows 2012 R2 domain and would like to migrate user mailboxes onto Office 365. User UPN is like user@mydomain.com and email address is different from UPN like user@ournewdomain.com.

    Do we need to match UPN to SMTP domain for AAD connect DirSync?

    Can we synchronize users and migrate mailboxes with both different domains?

    We are planning to AAD connector for DirSync for SSO with password hash.


    Tek-Nerd


    • Edited by Tek-Nerd Wednesday, May 22, 2019 7:19 PM
    Wednesday, May 22, 2019 7:18 PM

Answers

  • Hi Tek,

    Agree with Ed. It's strongly recommended to keep UPN and email address matching. Here is a blog explains it in details, for your reference:

    Office 365 – Why Your UPN Should Match Your Primary SMTP Address

    For Question 2, yes, you can sync users and migrate mailbox, although UPN domain and SMTP domain names are different.


    Best Regards,
    Niko Cheng


    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.


    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Thursday, May 23, 2019 9:53 AM
    Moderator
  • The UPN and SMTP address may have different domains but that is strongly discouraged.  I did have one customer who had to do this because of an on-premises security application that made use of the UPN.  They decided that it was more trouble to change the UPN than it was to train users of the difference and where to use each.

    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Thursday, May 23, 2019 7:19 PM
    Moderator

All replies

  • We have Exchange 2010 in Windows 2012 R2 domain and would like to migrate user mailboxes onto Office 365. User UPN is like user@mydomain.com and email address is different from UPN like user@ournewdomain.com.

    Do we need to match UPN to SMTP domain for AAD connect DirSync?

    Can we synchronize users and migrate mailboxes with both different domains?

    We are planning to AAD connector for DirSync for SSO with password hash.


    Tek-Nerd

    Wednesday, May 22, 2019 7:20 PM
  • >>> Do we need to match UPN to SMTP domain for AAD connect DirSync?

    It is not strictly required but strongly recommended if only to keep user confusion to a minimum.

    >>> Can we synchronize users and migrate mailboxes with both different domains?

    It depends on what you mean by "different domains".  AD domains?  E-mail domains?  AD forests?


    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Thursday, May 23, 2019 12:16 AM
    Moderator
  • Thank You.

    We want SSO for users. 

    I mean UPN domain and SMTP domain names are different.


    Tek-Nerd

    Thursday, May 23, 2019 8:56 AM
  • Hi Tek,

    Agree with Ed. It's strongly recommended to keep UPN and email address matching. Here is a blog explains it in details, for your reference:

    Office 365 – Why Your UPN Should Match Your Primary SMTP Address

    For Question 2, yes, you can sync users and migrate mailbox, although UPN domain and SMTP domain names are different.


    Best Regards,
    Niko Cheng


    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.


    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Thursday, May 23, 2019 9:53 AM
    Moderator
  • The UPN and SMTP address may have different domains but that is strongly discouraged.  I did have one customer who had to do this because of an on-premises security application that made use of the UPN.  They decided that it was more trouble to change the UPN than it was to train users of the difference and where to use each.

    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Thursday, May 23, 2019 7:19 PM
    Moderator