send email with ruby and gmail

require "net/smtp"
require "time" # for rfc2822
 
# sender
from_addr = "insert_from_address_here" 
# receiver
to_addr   = "insert_receiver_address_here"
 
mail_content = <<END_OF_CONTENT
From: #{from_addr}
To: #{to_addr}
Subject: Just a test
Date: #{Time.now.rfc2822}
 
Just a test of sending email via Ruby.
END_OF_CONTENT
 
smtp = Net::SMTP.new("smtp.gmail.com",587)
smtp.enable_starttls
smtp.start("smtp.gmail.com","your_gmail_username","your_gmail_password",:login) do
  smtp.send_message(mail_content, from_addr, to_addr)
end