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| <section> |
| <h2><a name="Mailet_Container_Configuration"></a>Mailet Container Configuration</h2> |
| |
| |
| <p>This documents explains how to configure Mail processing. Mails pass through the MailetContainer. The |
| MailetContainer is a Matchers (condition for executing a mailet) and Mailets (execution units that perform |
| actions based on incoming mail) pipeline arranged into processors (List of mailet/matcher pairs allowing |
| better logical organisation). You can read more about these concepts on <a href="feature-mailetcontainer.html">the mailet container feature description</a>.</p> |
| |
| |
| <p>Apache James Server includes a number of pre-packaged <a href="dev-provided-mailets.html">Mailets and Matchers</a>. |
| Futhermore, you can write and use with James your own <a href="dev-extend-matcher.html">custom matchers</a> and |
| <a href="dev-extend-mailet.html">custom mailets</a>.</p> |
| |
| |
| <p>Consult <a class="externalLink" href="https://github.com/apache/james-project/tree/master/server/apps/spring-app/src/main/resources/mailetcontainer.xml">mailetcontainer.xml</a> in GIT to get some examples and hints.</p> |
| |
| |
| <dl> |
| |
| <dt><b>context.postmaster</b></dt> |
| |
| <dd>The body of this element is the address that the server |
| will consider its postmaster address. This address will be listed as the sender address |
| of all error messages that originate from James. Also, all messages addressed to |
| postmaster@<servername>, where <servername> is one of the domain names whose |
| mail is being handled by James, will be redirected to this email address. |
| Set this to the appropriate email address for error reports |
| If this is set to a non-local email address, the mail server |
| will still function, but will generate a warning on startup.</dd> |
| |
| <dt><b>spooler.threads</b></dt> |
| |
| <dd>Number of simultaneous threads used to spool the mails. Set to zero, it disables mail processing - use with |
| caution.</dd> |
| |
| <dt><b>spooler.errorRepository</b></dt> |
| |
| <dd>Mail repository to store email in after several unrecoverable errors. Mails failing processing, for which |
| the Mailet Container could not handle Error, will be stored there after their processing had been attempted |
| 5 times. Note that if standard java Exception occurs, <b>Error handling</b> section below will be applied |
| instead.</dd> |
| </dl> |
| |
| <section> |
| <h3><a name="The_Mailet_Tag"></a>The Mailet Tag</h3> |
| |
| |
| <p>Consider the following simple <b>mailet</b> tag:</p> |
| <mailet match="RemoteAddrNotInNetwork=127.0.0.1" class="ToProcessor"><br /> |
| <processor>spam</processor><br /> |
| </mailet><br /> |
| |
| |
| <p>The mailet tag has two required attributes, <b>match</b> and <b>class</b>.</p> |
| |
| |
| <p>The <b>match</b> attribute is set to the value of the specific Matcher class to be instantiated with a an |
| optional argument. If present, the argument is separated from the Matcher class name by an '='. Semantic |
| interpretation of the argument is left to the particular mailet.</p> |
| |
| |
| <p>The <b>class</b> attribute is set to the value of the Mailet class that is to be instantiated.</p> |
| |
| |
| <p>Finally, the children of the <b>mailet</b> tag define the configuration that is passed to the Mailet. The |
| tags used in this section should have no attributes or children. The names and bodies of the elements will be passed to |
| the mailet as (name, value) pairs.</p> |
| |
| |
| <p>So in the example above, a Matcher instance of RemoteAddrNotInNetwork would be instantiated, and the value "127.0.0.1" |
| would be passed to the matcher. The Mailet of the pair will be an instance of ToProcessor, and it will be passed the (name, value) |
| pair of ("processor", "spam").</p> |
| |
| </section> |
| |
| <section> |
| <h3><a name="Error_handling"></a>Error handling</h3> |
| |
| <p>If an exception is encountered during the execution of a mailet or a matcher, the default behaviour is to |
| process the mail using the <b>error</b> processor.</p> |
| |
| |
| <p>The <b>onMailetException</b> property allows you to override this behaviour. You can specify another |
| processor than the <b>error</b> one for handling the errors of this mailet. <br /> |
| |
| The <b>ignore</b> special value also allows to continue processing and ignore the error. <br /> |
| The <b>propagate</b> special value causes the mailet container to rethrow the |
| exception, propagating it to the execution context. In an SMTP execution context, the spooler will then requeue |
| the item and automatic retries will be setted up - note that attempts will be done for each recipients. In LMTP |
| (if LMTP is configured to execute the mailetContainer), the entire mail transaction is reported as failed to the caller.</p> |
| |
| |
| <p>Moreover, the <b>onMatcherException</b> allows you to override matcher error handling. You can |
| specify another processor than the <b>error</b> one for handling the errors of this mailet. The <b>matchall</b> |
| special value also allows you to match all recipients when there is an error. The <b>nomatch</b> |
| special value also allows you to match no recipients when there is an error.</p> |
| |
| |
| <p>Here is a short example to illustrate this:</p> |
| |
| |
| <div> |
| <pre><mailet match=RecipientIsLocal class="LocalDelivery"> |
| <onMailetException>deliveryError</onMailetException> |
| <onMatcherException>nomatch</onMatcherException> |
| </mailet> |
| </pre></div> |
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