6.4. Summary

  • A few timeouts can improve email server performance, but most shouldn’t be adjusted.

  • On I/O-bound machines, throttling connections based on load limits usually isn’t as effective as it might at first seem.

  • Significant performance gains cannot generally be realized by making sendmail less security conscious than it is by default.

  • Features such as STARTTLS and mail filters are wonderful from a utility standpoint, but they may have significant performance implications.

  • A FallbackMX host can help relieve the load from email servers sending messages out to the Internet.

  • A Spillover host can queue up messages coming from the Internet into an organization if the organization’s primary machines cannot respond due to load problems or a network ...

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