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chrisk/gist:356034

Created April 5, 2010 04:49
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Check an email address domain's validity using MX records
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# Check an email address domain's validity using MX records
require 'resolv'
def known_email_domain?(email)
domain = email.match(/\@(.+)/)[1]
Resolv::DNS.open { |dns| dns.getresources(domain, Resolv::DNS::Resource::IN::MX) }.any?
end
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