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Explain why a local cache dns server helps a lot.

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Zhang Huangbin 2015-07-07 21:25:51 +08:00
parent 8683a8a406
commit d9be80bae9
2 changed files with 11 additions and 2 deletions
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6
howto/0-performance.tuning.md
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@ -8,7 +8,11 @@ you can follow below suggestions for better performance.
### Setup a DNS server in LAN or localhost to cache DNS queries
Mail services heavily rely on DNS service and perform many many DNS queries,
a cache DNS server in LAN or localhost helps a lot.
a cache DNS server in LAN or localhost helps a lot:
* It speeds up DNS queries. This helps a lot.
* It reduces DNS queries to DNSBL servers, so that you can continue using their
excellent service without exceeding the max query limit.
### Enable postscreen service to help reduce spam

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html/performance.tuning.html
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@ -25,7 +25,12 @@
you can follow below suggestions for better performance.</p>
<h3 id="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,
a cache DNS server in LAN or localhost helps a lot.</p>
a cache DNS server in LAN or localhost helps a lot:</p>
<ul>
<li>It speeds up DNS queries. This helps a lot.</li>
<li>It reduces DNS queries to DNSBL servers, so that you can continue using their
excellent service without exceeding the max query limit.</li>
</ul>
<h3 id="enable-postscreen-service-to-help-reduce-spam">Enable postscreen service to help reduce spam</h3>
<ul>
<li><a href="./enable.postscreen.html">Enable postscreen service</a></li>