smtp_test.rb

require 'pry'
require 'resolv'
require 'net/smtp'
require 'socket'
# Create resolver instance
resolver = Resolv::DNS.new

# Get MX records
mx_records = resolver.getresources "producthunt.com", Resolv::DNS::Resource::IN::MX
# mx = mx_records.first.exchange.to_s
# s = TCPSocket.open(mx, 25)

mx_records.each do |mx_record|
  begin
    mx = mx_record.exchange.to_s
    puts mx
    Net::SMTP.start(mx,25) do |smtp|
      rcpt = smtp.rcptto('ryan@producthunt.com')
      binding.pry
    end
  rescue Net::OpenTimeout => e
    puts e.message
  end
end