It may be hard to explain but it will take the root domain and use that. I can shoot some examples and that may be easier.
mail.smartertools.com -> smartertools.com
we.are.smartermail.com -> smartermail.com
We pull from the address bar and do some parsing of the URL to get to root domain, we then match that up with what is in SmarterMail.
Matt Petty
Software Developer
SmarterTools Inc.
(877) 357-6278
www.smartertools.com