title: Adding sensitive data to heroku application (ruby on rails)
body: <p>I am trying to set up a mailer with my heroku application. I fear if I push up my production.rb, my gmail password will be exposed. How can I prevent this?</p>
  
  <pre><code>Production.rb:
    ActionMailer::Base.smtp_settings = {
      :address        =&gt; "smtp.gmail.com",
      :port           =&gt; 587,
      :authentication =&gt; :plain,
      :user_name      =&gt; "whatever@gmail.com",
      :password       =&gt; "**********"
    }
  </code></pre>