32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
# Performance tuning
|
|
|
|
[TOC]
|
|
|
|
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](./enable.postscreen.html)
|
|
|
|
If you don't want to use postscreen service, you can [enable DNSBL service](./enable.dnsbl.html)
|
|
instead, it helps a lot too. Although both `postscreen` and pure DNSBL services
|
|
uses the same DNSBL servers, but `postscreen` offers additional solutions to
|
|
reduce spam, so postscreen is better.
|
|
|
|
postscreen and DNSBL service help catch a lot spam before putting the spams
|
|
in local mail queue, so they save much system resource.
|
|
|
|
### Update Amavisd + Postfix config files to process more emails concurrently
|
|
|
|
* [Process more emails concurrently](./concurrent.processing.html)
|