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Comment by grepular | Hacker News Reader

FWIW, gmal.com has neither MX, nor A records so a couple of quick DNS lookups could have confirmed that the email address was incorrect.

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
    $

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

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

The email goes to that address at that other domain

Would some sort of distance score be more efficient though?