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<article class="doc">
<h1 class="page">Sieve</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>James servers are able to evaluate and execute Sieve scripts.</p>
</div>
<div class="paragraph">
<p>Sieve is an extensible mail filtering language. It&#8217;s limited
expressiveness (no loops or variables, no tests with side
effects) allows user created scripts to be run safely on email
servers. Sieve is targeted at the final delivery phase (where
an incoming email is transferred to a user&#8217;s mailbox).</p>
</div>
<div class="paragraph">
<p>The following Sieve capabilities are supported by Apache James:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://www.ietf.org/rfc/rfc2234.txt">RFC 2234 ABNF</a></p>
</li>
<li>
<p><a href="https://www.ietf.org/rfc/rfc2244.txt">RFC 2244 ACAP</a></p>
</li>
<li>
<p><a href="https://www.ietf.org/rfc/rfc2298.txt">RFC 2298 MDN</a></p>
</li>
<li>
<p><a href="https://tools.ietf.org/html/rfc5228">RFC 5228 Sieve</a></p>
</li>
<li>
<p><a href="https://tools.ietf.org/html/rfc4790">RFC 4790 IAPCR</a></p>
</li>
<li>
<p><a href="https://tools.ietf.org/html/rfc5173">RFC 5173 Body Extension</a></p>
</li>
<li>
<p><a href="https://datatracker.ietf.org/doc/html/rfc5230">RFC 5230 Vacations</a></p>
</li>
</ul>
</div>
<div class="paragraph">
<p>To be correctly executed, please note that the <strong>Sieve</strong> mailet is required to be positioned prior the
<strong>LocalDelivery</strong> mailet.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_managing_sieve_scripts"><a class="anchor" href="#_managing_sieve_scripts"></a>Managing Sieve scripts</h2>
<div class="sectionbody">
<div class="paragraph">
<p>A user willing to manage his Sieve scripts on the server can do so via several means:</p>
</div>
<div class="paragraph">
<p>He can ask an admin to upload his script via the <a href="../operate/cli.html" class="xref page">CLI</a></p>
</div>
<div class="paragraph">
<p>As James supports ManageSieve (<a href="https://datatracker.ietf.org/doc/html/rfc5804">RFC-5804</a>) a user
can thus use compatible software to manage his Sieve scripts.&lt;/p&gt;</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_managesieve_protocol"><a class="anchor" href="#_managesieve_protocol"></a>ManageSieve protocol</h2>
<div class="sectionbody">
<div class="paragraph">
<p><strong>WARNING</strong>: ManageSieve protocol should be considered experimental.</p>
</div>
<div class="paragraph">
<p>Consult <a href="https://github.com/apache/james-project/blob/master/server/apps/distributed-app/sample-configuration/managesieveserver.xml">managesieveserver.xml</a>
in GIT to get some examples and hints.</p>
</div>
<div class="paragraph">
<p>The service is controlled by a configuration block in the managesieveserver.xml.
The managesieveserver tag defines the boundaries of the configuration block. It encloses
all the relevant configuration for the ManageSieve server. The behavior of the ManageSieve service is
controlled by the attributes and children of this tag.</p>
</div>
<div class="paragraph">
<p>This tag has an optional boolean attribute - <strong>enabled</strong> - that defines whether the service is active or not.
The value defaults to "false" if
not present.</p>
</div>
<div class="paragraph">
<p>The standard children of the managesieveserver tag are:</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<caption class="title">Table 1. managesieveserver.xml content</caption>
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Property name</th>
<th class="tableblock halign-left valign-top">explanation</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">bind</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Configure this to bind to a specific inetaddress. This is an optional integer value. This value is the port on which this ManageSieve server is configured to listen. If the tag or value is absent then the service
will bind to all network interfaces for the machine If the tag or value is omitted, the value will default to the standard ManageSieve port (port 4190 is the well-known/IANA registered port for ManageSieve.)</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">tls</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Set to true to support STARTTLS or SSL for the Socket.
To use this you need to copy sunjce_provider.jar to /path/james/lib directory. To create a new keystore execute:
<code>keytool -genkey -alias james -keyalg RSA -storetype PKCS12 -keystore /path/to/james/conf/keystore</code>.
Please note that each ManageSieve server exposed on different port can specify its own keystore, independently from any other
TLS based protocols.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">connectionBacklog</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Number of connection backlog of the server (maximum number of queued connection requests)</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">connectiontimeout</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Connection timeout in seconds</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">connectionLimit</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Set the maximum simultaneous incoming connections for this service</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">connectionLimitPerIP</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Set the maximum simultaneous incoming connections per IP for this service</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">bossWorkerCount</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Set the maximum count of boss threads. Boss threads are responsible for accepting incoming ManageSieve connections
and initializing associated resources. Optional integer, by default, boss threads are not used and this responsibility is being dealt with
by IO threads.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">ioWorkerCount</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Set the maximum count of IO threads. IO threads are responsible for receiving incoming ManageSieve messages and framing them
(split line by line). IO threads also take care of compression and SSL encryption. Their tasks are short-lived and non-blocking.
Optional integer, defaults to 2 times the count of CPUs.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">maxExecutorCount</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Set the maximum count of worker threads. Worker threads takes care of potentially blocking tasks like executing ManageSieve commands.
Optional integer, defaults to 16.</p></td>
</tr>
</tbody>
</table>
</div>
</div>
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