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<title> How to use Gmail POP/SMTP services from unsecure clients
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<a href="https://frommelmak.com/how-to-use-gmail-popsmtp-services-from-unsecure-clients.html" rel="bookmark" title="Permalink to How to use Gmail POP/SMTP services from unsecure clients">How to use Gmail <span class="caps">POP</span>/<span class="caps">SMTP</span> services from unsecure clients</a>
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<p>Sometimes you may need to send or retrieve email notifications using <span class="caps">SMTP</span> or <span class="caps">POP</span> Gmail services, but your client does not support <span class="caps">SSL</span> connections. In such cases you can use a <span class="caps">SSL</span> proxy tunnel such as stunnel.</p>
<p>stunnel is available as a Debian package, and probably in other modern Linux distributions. It is also available as Win32 binary.
The installation in debian is as simple as type:</p>
<div class="highlight pygments-style-monokai rounded shadow-sm mb-3"><pre><span></span><code><span class="go">apt-get install stunnel</span>
</code></pre></div>
<p>Since stunnel relies on OpenSSL libraries, the first thing is create a x509 cert.</p>
<div class="highlight pygments-style-monokai rounded shadow-sm mb-3"><pre><span></span><code><span class="go">cd /etc/ssl/certs</span>
<span class="go">openssl req -new -x509 -days 3650 -nodes -out stunnel.pem -keyout stunnel.pem</span>
</code></pre></div>
<p>Then you need to configure stunnel in order to forward all the traffic in the 110 (<span class="caps">POP</span>) and 25 (<span class="caps">SMPT</span>) to the Gmail 995 and 465 ports respectively.</p>
<div class="highlight pygments-style-monokai rounded shadow-sm mb-3"><pre><span></span><code><span class="go">/etc/stunnel/stunnel.conf</span>
<span class="go">[pop3s]</span>
<span class="go">accept = server_ip_address:110 </span>
<span class="go">connect = pop.gmail.com:995</span>
<span class="go">[ssmtp] </span>
<span class="go">accept = server_ip_address:25</span>
<span class="go">connect = smtp.gmail.com:465</span>
</code></pre></div>
<p>The server_ip_address could be the <span class="caps">LAN</span> interface <span class="caps">IP</span> address or the localhost, depending if the client program is running localy or in some other host in your <span class="caps">LAN</span>.</p>
<p>Finaly, just start de service:</p>
<div class="highlight pygments-style-monokai rounded shadow-sm mb-3"><pre><span></span><code><span class="go">/etc/init.d/stunnel4 start</span>
</code></pre></div>
<p>And test the service:</p>
<div class="highlight pygments-style-monokai rounded shadow-sm mb-3"><pre><span></span><code><span class="go">telnet server_ip_address 110</span>
<span class="go">Trying ...</span>
<span class="go">Connected to somehost.</span>
<span class="go">Escape character is '^]'.</span>
<span class="go">+OK Gpop ready for requests from xx.xx.xx.xx dewf14449283wbe.15</span>
<span class="go">USER [email protected]</span>
<span class="go">+OK send PASS</span>
<span class="go">PASS your_gmail_pass</span>
<span class="go">+OK Welcome.</span>
<span class="go">LIST</span>
<span class="go">+OK 2 messages (23782 bytes)</span>
<span class="go">1 3124</span>
<span class="go">2 2758</span>
</code></pre></div>
<p>If you can connect with telnet, your client can do it too.</p>
<p><a href="https://twitter.com/oriolrius">@oriolrius</a>, thanks for telling me about this tool.</p>
<p>For more info visit: <a href="http://www.stunnel.org">www.stunnel.org</a>.</p>
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