app/views/user_mailer/email_confirmation.html.erb
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<p>Welcome to the course!</p>
<p>Please click the following link to confirm that this is your email address for the mooc.fi account <%= @user.email %>.<%= @origin ? " The account was created from '#{@origin}'." : '' %> </p>
<a href="<%= @url %>"><%= @url %></a>
<p>Best regards,<br />
MOOC team<br />
University of Helsinki</p>
</body>
</html>