mailmachine.rb

#!/usr/bin/env ruby
require 'net/smtp'

module MailMachine 
  class NetSmtp < Net::SMTP
    class << self
      EXCEPTIONS = [Net::SMTPAuthenticationError, 
                    Net::SMTPServerBusy, 
                    Net::SMTPSyntaxError, 
                    Net::SMTPFatalError, 
                    Net::SMTPUnknownError, 
                    Net::OpenTimeout]
      def start_server(server, port, helo, from, to)
        ## Options for sent mail ##
        # `server`    - typical 'localhost' #string
        # `port`      - typical '9999'  #integer
        # `helo`      - domain name server.Should be good! #string
        # `from`      - from email or name #string
        # `to`        - email to #string
        ############################################
        ## Debug to mailcatcher
        server ||= '127.0.0.1'
        port   ||= 1025
        helo   ||= 'localhost' 
        #######################
        begin
          smtp = new(server, port).start(helo)
          #Very bad open hole
          smtp.set_debug_output $stderr
          smtp.send_message("this can be email template", from, [to])
          smtp.finish
        rescue *EXCEPTIONS => e 
          response = Net::SMTP::Response.parse(e.to_s) 
        rescue Exception => e
          response = Net::SMTP::Response.new("666", e.to_s) 
        end
        response ||= Net::SMTP::Response.new("250", "Email delivery")
      end
    end
  end
end

resolv.rb

#!/usr/bin/env ruby
require 'resolv'

module MailMachine
  class Validator
    def initialize(name)
      @name = name.split('@').last
    end

    def servers_list
      Resolv::DNS.open.getresources(@name, Resolv::DNS::Resource::IN::MX).map do |resolv|
        resolv.exchange.to_s
      end    
    end

    def server
      servers_list.find do |name|
        Resolv.getaddress(name) =~ Resolv::AddressRegex
      end
    rescue Resolv::ResolvError => e
      #holly molyy
      return false if e.is_a? Exception
    end
  end
end