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| <!-- Licensed to the Apache Software Foundation (ASF) under one |
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| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
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| |
| <div class="section"><h2>DNS Service Configuration<a name="DNS_Service_Configuration"></a></h2> |
| |
| <div class="section"><h3>dnsservice.xml<a name="dnsservice.xml"></a></h3> |
| |
| <p>Consult <a class="externalLink" href="http://svn.apache.org/repos/asf/james/server/trunk/app/src/main/resources/dnsservice-template.xml">dnsservice-template.xml</a> in SVN to get some examples and hints.</p> |
| |
| <p>Specifies DNS Server information for use by various components inside Apache James Server.</p> |
| |
| <p>DNS Transport services are controlled by a configuration block in |
| the dnsservice.xml. This block affects SMTP remote delivery.</p> |
| |
| <p>The dnsservice tag defines the boundaries of the configuration |
| block. It encloses all the relevant configuration for the DNS server. |
| The behavior of the DNS service is controlled by the attributes and |
| children of this tag.</p> |
| |
| <dl> |
| <dt><b>servers</b></dt> |
| <dd>Information includes a list of DNS Servers to be used by James. These are |
| specified by the server elements, each of which is a child element of the |
| servers element. Each server element is the IP address of a single DNS server. |
| The servers element can have multiple server children. Enter ip address of your DNS server, one IP address per server |
| element. If no DNS servers are found and you have not specified any below, 127.0.0.1 will be used </dd> |
| <dt><b>autodiscover</b></dt> |
| <dd>true or false - If you use autodiscover and add DNS servers manually a combination of all the DNS servers will be used |
| If autodiscover is true, James will attempt to autodiscover the DNS servers configured on your underlying system. |
| Currently, this works if the OS has a unix-like /etc/resolv.xml, |
| or the system is Windows based with ipconfig or winipcfg. Change autodiscover to false if you would like to turn off autodiscovery |
| and set the DNS servers manually in the servers section </dd> |
| <dt><b>authoritative</b></dt> |
| <dd><b>true/false</b> - This tag specifies whether or not |
| to require authoritative (non-cached) DNS records; to only accept DNS responses that are |
| authoritative for the domain. It is primarily useful in an intranet/extranet environment. |
| This should always be <b>false</b> unless you understand the implications.</dd> |
| <dt><b>maxcachesize</b></dt> |
| <dd>Maximum number of entries to maintain in the DNS cache (typically 50000)</dd> |
| <dt><b>singleIPperMX</b></dt> |
| <dd>true or false (default) - Sepcifies if Apache James Server must try a single server for each multihomed mx host</dd> |
| </dl> |
| |
| </div> |
| |
| </div> |
| <!-- Commented because no more applicable? (we are running now on JDK 1.5) |
| |
| <section name="Sun JVM DNS Lookup Configuration."> |
| |
| <p>Sun's JVM Internet address lookup uses a cache which is unbounded and doesn't time out.<br/> |
| This is obviously not great for a long running process like a mail server so we have introduced a system property <strong>networkaddress.cache.ttl</strong> |
| that is used by the distributed phoenix start-up scripts, at startup, to override the java 1.4 <strong>Security.setProperty("networkaddress.cache.ttl")</strong>.<br/> |
| By default this is set to <strong>300</strong> seconds.</p> |
| |
| <p>This workaround will only be present if you use James as distributed. If you use James in any other container, including different versions of Spring, |
| you will need to ensure that you make a similar configuration change to allow the internet address cache to perform acceptably.</p> |
| |
| <p>Apache James Server 3.0 has this workaround and it requires it to operate acceptably. Future versions of James will continue to have the workaround in place |
| but will *not* require it. This will provide continued support for any mailets which you may deploy from other sources which might continue to use Sun's InetAddress class for DNS resolution.</p> |
| |
| <p>We are not currently aware of the behaviour of this cache in other JVM implementations, nor of the effect, if any, which this change might have on them</p> |
| |
| <p>For more on this read defect report <a href="http://issues.apache.org/jira/browse/JAMES-592">JAMES-592</a> and related defects.</p> |
| |
| </section> --> |
| |
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