title: Why CSS is not working when sending HTML email?
body: <p>As I am using SendGrid service at heroku, I've noticed that when I send HTML based emails, the CSS has no effect, can any one tell me what could be wrong ?</p>
  
  <p>I tried to send it as html.haml, html.erb, but both didn't work, although the images are viewed correctly in the sent emails.</p>
  
  <p>Any idea ?</p>