Email Validation - Accepting Business Email Id but not Personal Email Id

 Hi  Team, 
As of my requirement , I have a registration Form , where in  I want To accept Business Email Id ,  Lets any Company Named  as 'xyz'   , lets say 
the email Id Would be   AnyName@xyz.com   , the form should Accept It.    But  Incase , if there is Personal Email Id's of the domain Yahoo , Gmail  etc.
Example : AnyName@gmail.com it should not Be accepted , Should be validation  for this . 
In My Case ,  I m provided with list which contains  1000 domain name , which  System should not accept .   I have one approach of writing the Stored Procedures ,   
reading the domain list from table  ,    and Comparing Whether the Domain  Entered in the textbox  , Exist in the Domain list , If yes then Validate and return False ...