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Change default Portal.office.com URL to custom URL

    Question

  • Hello All,

    Is it possible to change the default URL of Exchange Online "portal.office.com" to custom URL.

    We had a phishing attack is our org and few of our users shared their credentials which resulted in unauthorized access and SPAM emails from their mailbox.

    Thanks in advance.

    Regards,

    Kapil K

    Thursday, June 7, 2018 6:19 AM

All replies

  • No, the URL is one and the same for all O365 customers. You can create some form of URL redirect (via IIS or just a simple CNAME), such as mail.domain.com, but you have to point back to that URL.
    Thursday, June 7, 2018 6:33 AM
  • In addition, I recommend to deploy multi-factor authentication to prevent "share credential", it's very dangerous.

    Best Regards,
    Allen Wang


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    Friday, June 8, 2018 7:27 AM
    Moderator
  • Hi,

    Any further help we can do for you?
    If it's solved, would you please post the solution here to share it with us? Thanks.
    Also, please free to mark the useful reply as answer. Thanks for your cooperation.

    Best Regards,
    Allen Wang


    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.

    Friday, June 15, 2018 1:45 AM
    Moderator
  • Hello Allen and Vasil,

    Thanks for your inputs. However I am thinking of putting internet facing reverse proxy with new name space  in the front and allow all access to go through that reverse proxy to "portal.office.com" and blocking access to portal from all locations with exception rule to reverse proxy private and public IP in Azure. Users will have to first hit my reverse proxy appliance to get access to portal.office.com or their mailbox. 

    Hope that works.

    Regards,

    Kapil

    Friday, June 15, 2018 6:31 AM