Comment on Mailcheck.js - How we decreased sign up confirmation email bounces by 50%Comments−papaf14yAnother option is checking server side using whatever is your language equivalent of: http://search.cpan.org/~rjbs/Email-Valid-0.188/lib/Email/Val...This checks email addresses using regexps and DNS.−ceejayoz14yI'd imagine domain squatters have snapped up all the common misspellings of popular mail providers, so a DNS lookup probably isn't as beneficial as you might imagine.
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Another option is checking server side using whatever is your language equivalent of: http://search.cpan.org/~rjbs/Email-Valid-0.188/lib/Email/Val...
This checks email addresses using regexps and DNS.
I'd imagine domain squatters have snapped up all the common misspellings of popular mail providers, so a DNS lookup probably isn't as beneficial as you might imagine.