Custom/vanity domain name configuration in Exchange Online

Iron Contributor

Currently, when users 'Add account' in Microsoft Outlook 2016, the users are automatically configured (possibly through autodiscovery) to connect to '' exchange server.


However, I would like them to be automatically configured to connect through our vanity URL, like ''.


And I would like the same with:

1) For SMTP: instead of

2) For POP, IMAP and Exchange Online: instead of (with the respective ports)

3) For OWA: instead of


How can this be configured?


Thanking you,

1 Reply

Such configuration is only possible if you are using on-premises Exchange server. In Exchange Online the endpoints are fixed and you cannot change them. You can easily create a solution for #3 though, by creating  CNAME with the corresponding value and using it to redirect to the O365 OWA endpoint.