ruby sending mail

mail.rb

def send_email(to, subject, body)
 
  puts "sending email => #{subject}"
  IO.popen(CONFIG[:sendmail_command],"w+") do |sm|
    message =
      %Q{Date: #{Time.now}
From: House Notify <notify@joblet.jp>
To: #{to}
Subject: #{subject}
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-2022-jp
 
#{body}
 
}
    puts message
    sm.print(message)
    sm.flush
  end
end