title: sendgrid addon on heroku and devise
body: <p>Please help! I can't seem the get the sendgrid addon to work, and I have devise. Is there a way just to use a devise as a sender of e-mails, if so, then how? Or what am I doing wrong:
  Here is my significant config/initializers/devise.rb code:</p>
  
  <pre><code> Devise.setup do |config|
     # ==&gt; Mailer Configuration
  
     #config.mailer_sender = "myapp.herokuapp.com"
  
     # Configure the class responsible to send e-mails.
     #config.mailer = "Devise::Mailer"
  </code></pre>
  
  <p>Do I have to uncomment this if i want to use sendgrid?</p>
  
  <p>In enviroment/production.rb I have: </p>
  
  <pre><code> config.action_mailer.default_url_options = { :host =&gt; 'myapp.herokuapp.com' }
  </code></pre>