How to Search Email Address in Active Directory

Once in a while when you try to assign a new email address to a user account, you encountered a specific email address you would like to assign has been taken. In a small Active Directory environment, the task to find an email address is easy, but if what if your environment consisted of thousands of accounts?

Here is the simplest way to find an email address that has already been assigned to a user account.

1. Go to Active Directory User Computer
2. Right click your Domain and select Find
3. Under the drop down menu of Find, select Custom Search
4. Under the drop down menu of In, select Entire Directory
5. Click on the Advanced tab, then type

proxyaddresses=smtp:emailaddress@yourcompany.com 

Note: change 'emailaddress' with email address you'd try to search and replace 'yourcompany.com' with your domain.