FWIW, gmal.com has neither MX, nor A records so a couple of quick DNS lookups co...

ralph · on Feb 1, 2012

Others are nabbed though.

    $ for t in mx a; do dig +short gmial.com $t; done
    0 nullmx.domainmanager.com.
    208.87.34.15
    74.86.197.160
    $

mike-cardwell · on Feb 1, 2012

Yes. Some domains have DNS records. That is correct.

DanBC · on Feb 1, 2012

What happens if the user makes a typo but enters a valid email address at some other domain?

mike-cardwell · on Feb 1, 2012

The email goes to that address at that other domain

alexchamberlain · on Feb 1, 2012

Would some sort of distance score be more efficient though?