Our Data is different !  We use the web to verify all the records held in our database.
Using conventional mailing lists and other relevant business data our dedicated offshore research team searches on the web to find each business listed. When found they visit that firm’s website to confirm and verify email address details, business activities and other relevant data.
Then every few months in order to keep the resulting data up to date we send a verification email to the addresses in our database and we simply delete out the addresses that bounce.