Search for unwanted domain
Type of policy: Reg ex
What its used for: Identify different domains within your site, which you may or may not want.
How its set up:
Set policy to “Page does not contain" the Regular Expression
Add the domain that you are trying to identify
Example of policy:
benson\.edu(note the slash after the domain)
For background information on where to create Custom Checks, please see this article.