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Performance tuning
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If you're running a busy mail server (many inbound/outbound emails every day), 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:
- 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
If you don't want to use postscreen service, you can enable DNSBL service instead, it helps a lot too, but less effective than postscreen service.
postscreen and DNSBL service help catch a lot spam, save much system resource.