content/howTo/custom-smtp-hooks.html - james-site - Git at Google

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 <!-- Main -->
 <div id="main">

     <!-- Introduction -->
     <section id="intro" class="main special">
         <div class="">
             <div class="content align-left">
                 <header class="major">
                     <h1><b>Configure Custom SMTP hooks</b></h1>
                 </header>

                 <p>
                     The current project demonstrates how to write custom behaviors for Apache James SMTP server
                     by the means of SMTP hooks.
                 </p>

                 <p>
                     SMTP hooks allow integrating third party systems with the SMTP stack and writing additional SMTP extensions, for
                     instance.
                 </p>

                 <p>
                     Start by importing the dependencies:
                 </p>

                 <pre><code>&lt;dependency&gt;
     &lt;groupId&gt;org.apache.james.protocols&lt;/groupId&gt;
     &lt;artifactId&gt;protocols-smtp/artifactId&gt;
 &lt;/dependency&gt;
                 </code></pre>

                 <ul>Allows writing the following hooks:
                     <li><b>AuthHook</b>: hook in the AUTH Command</li>
                     <li><b>HeloHook</b>: hook in the HELO Command</li>
                     <li><b>MailHook</b>: hook in the MAIL Command</li>
                     <li><b>MailParametersHook</b>: hook in the MAIL Command parameters</li>
                     <li><b>RcptHook</b>: hook in the RCPT Command</li>
                     <li><b>MessageHook</b>: hook in the DATA Command</li>
                     <li><b>QuitHook</b>: hook in the QUIT Command</li>
                     <li><b>UnknownHook</b>: hook for unknown commands</li>
                 </ul>

                 <pre><code>&lt;dependency&gt;
     &lt;groupId&gt;org.apache.james&lt;/groupId&gt;
     &lt;artifactId&gt;james-server-protocols-smtp&lt;/artifactId&gt;
 &lt;/dependency&gt;
                 </code></pre>

                 <p>James comes bundled with <a href="http://james.apache.org/server/dev-provided-smtp-hooks.html">provided SMTP hooks for common features</a>.
                     We encourage you to review them before starting writing your own hooks.</p>

                 <ul>Allows writing the following hooks:
                     <li><b>JamesMessageHook</b>: DATA command. Allows access to the message content.</li>
                 </ul>

                 <header class="major">
                     <h2><b>Writing your own hooks</b></h2>
                 </header>

                 <p>
                     Find this example on <a href="https://github.com/apache/james-project/tree/master/examples/custom-smtp-hooks">GitHub</a>.
                 </p>

                 <p>
                     In this example we implement a single RCPT hook:
                 </p>

                 <pre><code>public class LoggingRcptHook implements RcptHook {
     @Override
     public HookResult doRcpt(SMTPSession session, MaybeSender sender, MailAddress rcpt, Map&lt;String, String&gt; parameters) {
         System.out.println(&quot;RCPT TO &quot; + rcpt + &quot;with parameters &quot; + parameters);

         // Continue the SMTP transaction
         return HookResult.DECLINED;
     }
 }
                 </code></pre>

                 <p>You can compile this example project:</p>

                 <pre><code>mvn clean install</code></pre>

                 <p>Then embed your extension into a James server. First configure your hook:</p>

                 <pre><code>&lt;?xml version=&quot;1.0&quot;?&gt;
 &lt;smtpservers&gt;
     &lt;smtpserver enabled=&quot;true&quot;&gt;
         &lt;jmxName&gt;smtpserver-global&lt;/jmxName&gt;
         &lt;bind&gt;0.0.0.0:25&lt;/bind&gt;
         &lt;connectionBacklog&gt;200&lt;/connectionBacklog&gt;
         &lt;tls socketTLS=&quot;false&quot; startTLS=&quot;false&quot;&gt;
             &lt;keystore&gt;file://conf/keystore&lt;/keystore&gt;
             &lt;secret&gt;james72laBalle&lt;/secret&gt;
             &lt;provider&gt;org.bouncycastle.jce.provider.BouncyCastleProvider&lt;/provider&gt;
             &lt;algorithm&gt;SunX509&lt;/algorithm&gt;
         &lt;/tls&gt;
         &lt;!-- ... --&gt;
         &lt;handlerchain&gt;
             &lt;handler class=&quot;org.apache.james.smtpserver.fastfail.ValidRcptHandler&quot;/&gt;
             &lt;handler class=&quot;org.apache.james.smtpserver.CoreCmdHandlerLoader&quot;/&gt;
             &lt;handler class=&quot;org.apache.james.examples.LoggingRcptHook&quot;/&gt;
         &lt;/handlerchain&gt;
     &lt;/smtpserver&gt;
 &lt;/smtpservers&gt;
                 </code></pre>

                 <p>Then start a James server with your JAR and the configuration:</p>

                 <pre><code>docker run -d \
   -v $PWD/smtpserver.xml:/root/conf/smtpserver.xml \
   -v $PWD/exts:/root/extensions-jars \
   -p 25:25 \
   apache/james:memory-latest --generate-keystore
                 </code></pre>

                 <p>You can play with <code>telnet</code> utility with the resulting server:</p>

                 <pre><code>$ telnet 127.0.0.1 25
 Trying 127.0.0.1...
 Connected to 127.0.0.1.
 Escape character is '^]'.
 220 Apache JAMES awesome SMTP Server
 EHLO toto.com
 250-177b73020637 Hello toto.com [172.17.0.1])
 250-PIPELINING
 250-ENHANCEDSTATUSCODES
 250 8BITMIME
 RCPT TO: &lt;b@c.com&gt;
 503 5.5.0 Need MAIL before RCPT
 MAIL FROM: &lt;b@c.com&gt;
 250 2.1.0 Sender &lt;b@c.com&gt; OK
 RCPT TO: &lt;c@d.com&gt;
 550 5.7.1 Requested action not taken: relaying denied
 quit
                 </code></pre>

                 <p>
                     Now looking at the logs we can verify that our RCPT have well been executed:
                 </p>

                 <pre><code>06:49:15.734 [INFO ] o.a.j.GuiceJamesServer - JAMES server started
 06:49:30.275 [INFO ] o.a.j.p.n.BasicChannelUpstreamHandler - Connection established from 172.17.0.1
 06:50:18.892 [INFO ] o.a.j.i.n.ImapChannelUpstreamHandler - Connection established from 172.17.0.1
 06:50:19.152 [INFO ] o.a.j.i.n.ImapChannelUpstreamHandler - Connection closed for 172.17.0.1
 RCPT TO c@d.comwith parameters {TO:=, &lt;c@d.com&gt;=}</code></pre>

                 <p>Note that hooks can also be written for the LMTP protocol.</p>
             </div>
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	<h2>Emails at the heart of your business logic</h2>
	</header>

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	<!-- Main -->
	<div id="main">

	<!-- Introduction -->
	<section id="intro" class="main special">
	<div class="">
	<div class="content align-left">
	<header class="major">
	<h1><b>Configure Custom SMTP hooks</b></h1>
	</header>

	<p>
	The current project demonstrates how to write custom behaviors for Apache James SMTP server
	by the means of SMTP hooks.
	</p>

	<p>
	SMTP hooks allow integrating third party systems with the SMTP stack and writing additional SMTP extensions, for
	instance.
	</p>

	<p>
	Start by importing the dependencies:
	</p>

	<pre><code><dependency>
	<groupId>org.apache.james.protocols</groupId>
	<artifactId>protocols-smtp/artifactId>
	</dependency>
	</code></pre>

	<ul>Allows writing the following hooks:
	<li><b>AuthHook</b>: hook in the AUTH Command</li>
	<li><b>HeloHook</b>: hook in the HELO Command</li>
	<li><b>MailHook</b>: hook in the MAIL Command</li>
	<li><b>MailParametersHook</b>: hook in the MAIL Command parameters</li>
	<li><b>RcptHook</b>: hook in the RCPT Command</li>
	<li><b>MessageHook</b>: hook in the DATA Command</li>
	<li><b>QuitHook</b>: hook in the QUIT Command</li>
	<li><b>UnknownHook</b>: hook for unknown commands</li>
	</ul>

	<pre><code><dependency>
	<groupId>org.apache.james</groupId>
	<artifactId>james-server-protocols-smtp</artifactId>
	</dependency>
	</code></pre>

	<p>James comes bundled with <a href="http://james.apache.org/server/dev-provided-smtp-hooks.html">provided SMTP hooks for common features</a>.
	We encourage you to review them before starting writing your own hooks.</p>

	<ul>Allows writing the following hooks:
	<li><b>JamesMessageHook</b>: DATA command. Allows access to the message content.</li>
	</ul>

	<header class="major">
	<h2><b>Writing your own hooks</b></h2>
	</header>

	<p>
	Find this example on <a href="https://github.com/apache/james-project/tree/master/examples/custom-smtp-hooks">GitHub</a>.
	</p>

	<p>
	In this example we implement a single RCPT hook:
	</p>

	<pre><code>public class LoggingRcptHook implements RcptHook {
	@Override
	public HookResult doRcpt(SMTPSession session, MaybeSender sender, MailAddress rcpt, Map<String, String> parameters) {
	System.out.println("RCPT TO " + rcpt + "with parameters " + parameters);

	// Continue the SMTP transaction
	return HookResult.DECLINED;
	}
	}
	</code></pre>

	<p>You can compile this example project:</p>

	<pre><code>mvn clean install</code></pre>

	<p>Then embed your extension into a James server. First configure your hook:</p>

	<pre><code><?xml version="1.0"?>
	<smtpservers>
	<smtpserver enabled="true">
	<jmxName>smtpserver-global</jmxName>
	<bind>0.0.0.0:25</bind>
	<connectionBacklog>200</connectionBacklog>
	<tls socketTLS="false" startTLS="false">
	<keystore>file://conf/keystore</keystore>
	<secret>james72laBalle</secret>
	<provider>org.bouncycastle.jce.provider.BouncyCastleProvider</provider>
	<algorithm>SunX509</algorithm>
	</tls>
	<!-- ... -->
	<handlerchain>
	<handler class="org.apache.james.smtpserver.fastfail.ValidRcptHandler"/>
	<handler class="org.apache.james.smtpserver.CoreCmdHandlerLoader"/>
	<handler class="org.apache.james.examples.LoggingRcptHook"/>
	</handlerchain>
	</smtpserver>
	</smtpservers>
	</code></pre>

	<p>Then start a James server with your JAR and the configuration:</p>

	<pre><code>docker run -d \
	-v $PWD/smtpserver.xml:/root/conf/smtpserver.xml \
	-v $PWD/exts:/root/extensions-jars \
	-p 25:25 \
	apache/james:memory-latest --generate-keystore
	</code></pre>

	<p>You can play with <code>telnet</code> utility with the resulting server:</p>

	<pre><code>$ telnet 127.0.0.1 25
	Trying 127.0.0.1...
	Connected to 127.0.0.1.
	Escape character is '^]'.
	220 Apache JAMES awesome SMTP Server
	EHLO toto.com
	250-177b73020637 Hello toto.com [172.17.0.1])
	250-PIPELINING
	250-ENHANCEDSTATUSCODES
	250 8BITMIME
	RCPT TO: <b@c.com>
	503 5.5.0 Need MAIL before RCPT
	MAIL FROM: <b@c.com>
	250 2.1.0 Sender <b@c.com> OK
	RCPT TO: <c@d.com>
	550 5.7.1 Requested action not taken: relaying denied
	quit
	</code></pre>

	<p>
	Now looking at the logs we can verify that our RCPT have well been executed:
	</p>

	<pre><code>06:49:15.734 [INFO ] o.a.j.GuiceJamesServer - JAMES server started
	06:49:30.275 [INFO ] o.a.j.p.n.BasicChannelUpstreamHandler - Connection established from 172.17.0.1
	06:50:18.892 [INFO ] o.a.j.i.n.ImapChannelUpstreamHandler - Connection established from 172.17.0.1
	06:50:19.152 [INFO ] o.a.j.i.n.ImapChannelUpstreamHandler - Connection closed for 172.17.0.1
	RCPT TO c@d.comwith parameters {TO:=, <c@d.com>=}</code></pre>

	<p>Note that hooks can also be written for the LMTP protocol.</p>
	</div>
	<footer class="major">
	<ul class="actions align-center">
	<li><a href="index.html" class="button">go back to other how-tos</a></li>
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	Unless required by applicable law or agreed to in writing,
	software distributed under the License is distributed on an
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