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sendmail Performance Tuning by Nick Christenson

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5.4. Another Mailing List Strategy

A strategy that several sites have used to expedite email delivery deserves some mention, and this is as good a place to do it as any. The idea is to split up the reception of email messages and queue processing tasks with the notion that sending email can become more efficient by aggregating messages in the queue bound for a given destination rather than trying to send out email as it arrives. Basically, the sendmail daemon listening to port 25 will run in queue-only mode. That is, as messages come into the server, they are accepted and written to the queue, but no immediate delivery attempt is made. At the same time, several sendmail processes run that simply process the queue. Instead of initiating a sendmail ...

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