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sendmail Performance Tuning by Nick Christenson

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5.1. Mailing Lists

In their simplest form, mailing lists are single email addresses that represent more than one actual recipient, sometimes as many as hundreds of thousands of unique individuals. A mailing list server can never be certain when the next message for a given list might come in, but its goal will be to take a single incoming message for the list and send it out to all subscribers as quickly as possible. Messages might come in a flurry or a great deal of time may pass between them, but the server must be able to handle a large volume of messages in short order during times when the list heats up.

A mailing list server largely functions as a mail relay, as described earlier in this book, except that it sends much more outbound email ...

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