Research 2300 customers business type / market sector via Google and add to Excel

In order to send the right offers to the right buyers I need to add the Market Sector / Business Type to my Excel e-mailer database so I need the additional column filled in. Unfortunately, this may only be done by painstakingly doing Google searches on the company name within the email address.

There may not be as many as 2300 to research as there are 113 Hotmail addresses, which can be ignored, as can the 40 btinternet addresses and all other generic e-mail addresses for Private users rather than businesses.