ruby multipart mailer

filename = "test_mail.rb"
file = File.new("./"+filename, "r")
filecontent = ""
file.each do |line|
	filecontent << line
end
encodedcontent = [filecontent].pack("m")   # base64
marker = "TESTBOUNDARY"

body = <<MESSAGE_BODY
Hi ALL,

Regards,
Mr. XYZ.
p.s: i have sent this mail using some ruby script :)
MESSAGE_BODY

  message = <<MESSAGE
From: XYZ@xyz.com
To: XYZ@xyz.com
Subject: Sending Mails works
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary=#{marker}
--#{marker}
Content-Type: text/plain
Content-Transfer-Encoding:8bit
#{body}
--#{marker}
Content-Type: multipart/mixed; name=\"#{filename}\"
Content-Transfer-Encoding:base64
Content-Disposition: attachment; filename="#{filename}"

#{encodedcontent}
--#{marker}--
MESSAGE

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

Net::SMTP.start(
  'smtp.xyz.com',
  25,
  'xyz.com'
) do |smtp|

  smtp.send_message(
    message,
    'XYZ@xyz.com',
    [ ' XYZ@xyz.com']
  )
  smtp.finish
end