Review on EmailVerifier.com by Matt Kim

Easy to use, quick results in minutes! Can't ask for more than that!! Great product at fair price with no hidden fees or terms of services we weren’t aware about when signing up - just what you see exactly as advertised during signup process (no surprises after)! I highly recommend using this software if your looking into verifying eMail addresses from any website out there.

You can even filter by IP address which makes it easier not having all those different types/domains etc thrown together under one roof :).