diff --git a/html/allow.user.to.send.email.without.authentication.html b/html/allow.user.to.send.email.without.authentication.html
index 02227d40..c57aa467 100644
--- a/html/allow.user.to.send.email.without.authentication.html
+++ b/html/allow.user.to.send.email.without.authentication.html
@@ -20,6 +20,16 @@
 <p><a href="./allow.user.to.send.email.without.authentication-it_IT.html">Italiano</a> / <a href="./allow.user.to.send.email.without.authentication-zh_CN.html">简体中文</a> /</p>
 </div>
 <h1 id="allow-user-to-send-email-without-smtp-authentication">Allow user to send email without smtp authentication</h1>
+<div class="toc">
+<ul>
+<li><a href="#allow-user-to-send-email-without-smtp-authentication">Allow user to send email without smtp authentication</a><ul>
+<li><a href="#postfix">Postfix</a></li>
+<li><a href="#iredapd">iRedAPD</a></li>
+<li><a href="#references">References</a></li>
+</ul>
+</li>
+</ul>
+</div>
 <h2 id="postfix">Postfix</h2>
 <p>Create a plain text file: <code>/etc/postfix/sender_access.pcre</code>, list all
 users' email addresses which are allowed to send email without smtp