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Postfix Documentation
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Postfix Performance Tuning

Purpose of Postfix performance tuning

The hints and tips in this document help you improve the performance of Postfix systems that already work. If your Postfix system is unable to receive or deliver mail, then you need to solve those problems first, using the DEBUG_README document as guidance.

For tuning external content filter performance, first read the respective information in the FILTER_README and SMTPD_PROXY_README documents. Then make sure to avoid latency in the content filter code. As much as possible avoid performing queries against external data sources with a high or highly variable delay. Your content filter will run with a small concurrency to avoid CPU/memory starvation, and if any latency creeps in, content filter throughput will suffer. High volume environments should avoid RBL lookups, complex database queries and so on.

Topics on mail receiving performance:

Topics on mail delivery performance:

Other Postfix performance tuning topics:

The following tools can be used to measure mail system performance under artificial loads. They are normally not installed with Postfix.

Postfix Documentation
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