Copied from WebAppers.com
Mailcheck helps reduce typos in email addresses during sign ups. It can reduce the sign up confirmation email bounces by 50%.
Mailcheck included default domains are yahoo.com, google.com, hotmail.com, gmail.com, me.com, aol.com, mac.com, live.com, comcast.net, googlemail.com, msn.com, hotmail.co.uk, yahoo.co.uk, facebook.com, verizon.net, sbcglobal.net, att.net, gmx.com, and mail.com. The included default top level domains are com, net, org, info, edu, gov, co.uk, and mil.
License: MIT License