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sendmail Performance Tuning by Nick Christenson

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3.5. Networking

Handling file I/O efficiently is the most significant area for performance tuning of email servers. Second on the list is examining the system’s networking. Anyone who has been an Internet email administrator for any length of time has experienced the effects that network slowdowns or outages can have on an email server, so the fact that networking is important in email will come as no surprise. What may be more surprising is that less obvious networking issues may significantly affect service performance.

At one site, I spent a great deal of time talking with a customer about ways to improve email system performance. We discussed many of the issues mentioned in this book concerning improving the system’s I/O capability and such. ...

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