Multi-domain Login of Exchange Users

  • 7019544
  • 25-May-2017
  • 24-Jul-2017


Retain 3.x Exchange Module


My internal domain is gwava.local but I want my users to log in with their email addresses which end with


If you have multiple domains in your active directory tree or you have a different internal domain from your email domain you can change the LDAP login that your users use to log into Retain.

In Active Directory Domains and Trusts:
Right-click on the top container called "Active Directory Domains and Trusts" and select Properties
Here you can add Alternative UPN suffixes.
Click Apply, then OK.

Then you can go into the Exchange Admin Center
In Recipients/Mailboxes choose a user and edit them.
Here you can change the User logon name: and from the drop down choose the domain you want them to login with.

Finally you can attempt logging in as a user with that new domain into Retain. This will not create a new mailbox in Retain as the user is also identified by their GUID which is unique.

Look at the worker log to determine which autodiscover URL Exchange is returning to Retain. Make sure there is a record for the autodiscover server in the Exchange system.
The default port for autodiscover is 443.

See also: Exchange Autodiscover

Additional Information

This article was originally published in the GWAVA knowledgebase as article ID 2401.