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SpamAssassin by Alistair McDonald

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Summary

Bottlenecks can occur in a number of areas: memory, disk I/O, CPU and Network I/O. Memory (or RAM) is the main bottleneck when using SpamAssassin. Using SpamAssassin as a daemon improves performance.

Filtering out messages before SpamAssassin processes them reduces the load on the machine. This can be achieved in a number of ways.

SpamAssassin can run on separate machines and be accessed from the MTA. SQL can help to keep user settings in a single location even when multiple machines are in use. SQL is also used to increase performance.

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