How to allow only users with certain email addresses to register?

[IDEASBANK2009]

Good Day Fellow VBorgs!
I am currently trying to set up a Bulletin Board for an INTRANET site at work. We're using it to allow employees to have a place to post new and terrific ideas to make this a better work place!

Question: How can I allow only users with our company name in their email address to register as users? (i.e. say our company name is SmithInc. and all our email addresses are in the form of user.name@SmithInc.ca. We don't want anyone registering with user.name@hotmali.com etc... only email addresses within our company).
Thanks again,
IdeasBank2009

p.s. Steve Machol states there is no option to whitelist email addresses, only deny specific domains. Does any one know of an add on that will do this????

--------------- Added [DATE]1248465145[/DATE] at [TIME]1248465145[/TIME] ---------------

Well well!
I guess I wasn't the only one that had this idea! There is an emailrules addon! Thanks again VBULLETIN.ORG!