sending_mail_with_gmail.rb

require 'rubygems'
require 'mail'

Mail.defaults do
  smtp "smtp.gmail.com" do 
    port 587 
    enable_tls 
    user "[email protected]"
    pass "yomommasobig" 
    helo "localhost.localdomain" 
  end
end

mail = Mail.deliver do
  from "[email protected]"
  to "[email protected]"
  subject "grr, sending mail sux!"
  text_part do
    body "some text"
  end
  html_part do
   content_type 'text/html; charset=UTF-8'
   body "<h1>some html title</h1><p>aaa</p><p>bbb</p>"
  end
end