I had recently started a new job, and part of that was picking up the pieces my predecessor had left off with certain configurations particularly with Microsoft Exchange and multiple SMTP email addresses you normally apply to one user.

Finding these email addresses can sometimes be troublesome if they aren’t the default addresses of a particular user.

If you need to find which user an email address belongs to in your organisation, a great way to check is by utilising the custom advance search in Active Directory and here are the steps to do it;

1. Go to Active Directory Users and Computers, right click on the domain and click find
2. In the find field, change the criteria to ‘custom search’
3. Click on the advanced tab, now you can type in here, the custom search string you will use
4. If you’re looking for user@yourdomain.com then type in: proxyAddress=smtp:user@yourdomain.com

Here is an advance tip for you, wildcards can also be included in these searches, i.e. *.yourdomain.com and then change the view to add the proxyAddress column to see all of the search results with their proxyAddresses.

Edit – There is a correction above, it should be proxyAddresses=smtp:user@yourdomain.com