Performance tuning

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

• Enable postscreen service

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.

Update Amavisd + Postfix config files to process more emails concurrently

• Process more emails concurrently

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