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<section>
<h2><a name="Antispam_Configuration"></a>Antispam Configuration</h2>
<p>Apache James Server Anti-Spam system can be configured via two main different mechanisms:</p>
<ul>
<li>SMTP Hooks; see <a class="externalLink" href="https://github.com/apache/james-project/tree/master/server/apps/spring-app/src/main/resources/smtpserver.xml">examples</a>.</li>
<li>Mailets; see <a class="externalLink" href="https://github.com/apache/james-project/tree/master/server/apps/spring-app/src/main/resources/mailetcontainer.xml">examples</a>.</li>
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<section>
<h3><a name="AntiSpam_SMTP_Hooks"></a>AntiSpam SMTP Hooks</h3>
<p>&quot;FastFail&quot; SMTP Hooks acts to reject before spooling
on the SMTP level. SpamAssasin hook can be used as a fastfail hook, therefore
SpamAssassin must run as a server on the same machine as the Apache James Server.</p>
<p>SMTP Hooks for non-existent users, DSN filter, domains with invalid MX record,
can also be configured.</p>
</section>
<section>
<h3><a name="AntiSpam_Mailets"></a>AntiSpam Mailets</h3>
<ul>
<li>Black listing Mailet</li>
<li>Grey listing Mailet</li>
<li>SpamAssassin Mailet is designed to classify the messages as spam or not
with an configurable score threshold. Usually a message will only be
considered as spam if it matches multiple criteria; matching just a single test
will not usually be enough to reach the threshold.</li>
<li>BayesianAnalysis in the Mailet uses Bayesian probability to classify mail as
spam or not spam. It relies on the training data coming from the users&#x2019; judgment.
Users need to manually judge as spam and send to spam@thisdomain.com, oppositely,
if not spam they then send to not.spam@thisdomain.com. BayesianAnalysisfeeder learns
from this training dataset, and build predictive models based on Bayesian probability.
There will be a certain table for maintaining the frequency of Corpus for keywords
in the database. Every 10 mins a thread in the BayesianAnalysis will check and update
the table. Also, the correct approach is to send the original spam or non-spam
as an attachment to another message sent to the feeder in order to avoid bias from the
current sender's email header.</li>
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