<li><ahref="#setup-a-dns-server-in-lan-or-localhost-to-cache-dns-queries">Setup a DNS server in LAN or localhost to cache DNS queries</a></li>
<li><ahref="#enable-postscreen-service-to-help-reduce-spam">Enable postscreen service to help reduce spam</a></li>
<li><ahref="#update-amavisd-postfix-config-files-to-process-more-emails-concurrently">Update Amavisd + Postfix config files to process more emails concurrently</a></li>
</ul>
</li>
</ul>
</div>
<p>If you're running a busy mail server (many inbound/outbound emails every day),
you can follow below suggestions for better performance.</p>
<h3id="setup-a-dns-server-in-lan-or-localhost-to-cache-dns-queries">Setup a DNS server in LAN or localhost to cache DNS queries</h3>
<p>Mail services heavily rely on DNS service and perform many many DNS queries,
<p>If you don't want to use postscreen service, you can <ahref="./enable.dnsbl.html">enable DNSBL service</a>
instead, it helps a lot too, but less effective than postscreen service.</p>
<p>postscreen and DNSBL service help catch a lot spam, save much system resource.</p>
<h3id="update-amavisd-postfix-config-files-to-process-more-emails-concurrently">Update Amavisd + Postfix config files to process more emails concurrently</h3>
<ul>
<li><ahref="./concurrent.processing.html">Process more emails concurrently</a></li>
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