2015-07-07 08:09:17 -05:00
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# Performance tuning
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[TOC]
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If you're running a busy mail server (many inbound/outbound emails every day),
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you can follow below suggestions for better performance.
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### Setup a DNS server in LAN or localhost to cache DNS queries
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Mail services heavily rely on DNS service and perform many many DNS queries,
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2015-07-07 08:25:51 -05:00
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a cache DNS server in LAN or localhost helps a lot:
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* It speeds up DNS queries. This helps a lot.
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* It reduces DNS queries to DNSBL servers, so that you can continue using their
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excellent service without exceeding the max query limit.
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2015-07-07 08:09:17 -05:00
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### Enable postscreen service to help reduce spam
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* [Enable postscreen service](./enable.postscreen.html)
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If you don't want to use postscreen service, you can [enable DNSBL service](./enable.dnsbl.html)
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instead, it helps a lot too, but less effective than postscreen service.
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postscreen and DNSBL service help catch a lot spam, save much system resource.
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### Update Amavisd + Postfix config files to process more emails concurrently
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* [Process more emails concurrently](./concurrent.processing.html)
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