# Simple script to run through the list
# and spit out the domains that still
# respond with an MX record. 

require 'resolv'

def validate_email_domain(domain)
  Resolv::DNS.open do |dns|
    @mx = dns.getresources(domain, Resolv::DNS::Resource::IN::MX)
  end
  @mx.size > 0 ? true : false
end

File.open('./disposable-email-provider-domains') do |file|
  file.each_line do |domain|
    domain.strip!
    next if domain.empty?
    if validate_email_domain(domain)
      puts domain
    end
    sleep 0.2
  end
end