turned debug=true it is sending mails.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>Registration list</title>
<meta name="keywords" content="" />
<meta name="description" content="" />
<link href="/workshop/registrations/site-content/base.css" rel="stylesheet" type="text/css" media="screen" />
<link href="/workshop/registrations/site-content/forms.css" rel="stylesheet" type="text/css" media="screen" />
</head>
<body>
<div id="header">
<div id="logo">
<h1><a href="#">List of Registrants for upcoming workshops</a></h1>
<h2><a href="http://www.iitb.ac.in/">From FOSSEE Team</a></h2>
</div>
</div>
<!-- start page -->
<div id="page">
<!-- start content -->
<div id="content">
<p class="center">
{% block content %}
<table>
<tr>
<th> SNo </th>
<th> Name </th>
<th> Email </th>
<th> Phone Number </th>
<th> Discipline </th>
<th> Category </th>
<th> Affiliation </th>
<th> Workshop </th>
<th> Known programing languages </th>
</tr>
{% for registrant in registrants %}
<tr>
<td>{{ forloop.counter }}</td>
<td>{{ registrant.registrant.name }}</td>
<td>{{ registrant.registrant.email }}</td>
<td>{{ registrant.registrant.phonenumber }}</td>
<td>{{ registrant.registrant.discipline }}</td>
<td>{{ registrant.registrant.category }}</td>
<td>{{ registrant.registrant.affiliation }}</td>
<td>{{ registrant.registrant.workshop }}</td>
<td>{{ registrant.registrant.tools }}</td>
</tr>
{% endfor %}
</table>
{% endblock %}
</p>
</div>
<!-- end content -->
<div style="clear: both;"> </div>
</div>
<!-- end page -->
<div id="footer">
<p class="credit">Powered by the <a href="http://fossee.in/">FOSSEE</a> group, IITB</p>
</div>
</body>
</html>