gistfile1.rb

require 'rubygems'
require 'sinatra'
require 'pony_gmail' # the file that's linked above

post '/' do
  Pony.mail(:to=>"someeamil@example.com", 
            :from => 'yourgmail@yourdomian.com', 
            :subject=> "SUBJECT",
            :body => "BODY",
            :via => :smtp, :smtp => {
              :host       => 'smtp.gmail.com',
              :port       => '587',
              :user       => 'yourgmail@yourdomian.com',
              :password   => 'pazzword',
              :auth       => :plain,
              :domain     => "yourdomian.com"
             }
           )
  "Email sent!"
end