title: Mandrill invalid key error
body: <p>I have a problem with an app developing on cloud9. I'm using mandrill to send email but it gives me a problem with configuration. It seems to be an invalid key error but in local development it works with the same configuration...</p>
  
  <p>There are my smtp in development environment:</p>
  
  <pre><code>config.action_mailer.delivery_method = :smtp
  config.action_mailer.perform_deliveries = true
  config.action_mailer.default_url_options = { host: config.app_domain }
  config.action_mailer.smtp_settings = {
      address: 'smtp.mandrillapp.com', 
      port: '587',
      enable_starttls_auto: true,
      user_name: ENV['mandrill_username'],
      password:  ENV['mandrill_password'],
      authentication: :plain,
      domain:    ENV['mandrill_domain']
  }
  </code></pre>
  
  <p>Thanks for help.</p>