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sendmail Performance Tuning by Nick Christenson

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5.2. Command-Line Message Generation

A collection of messages to be sent may reside in files on local storage, or the messages may be generated on the fly by a UNIX process that then hands them off for delivery by sendmail via a socket or a pipe. Sometimes the latter approach is called “interactive” email delivery. While it technically has nothing to do with sendmail’s “interactive” delivery mode, starting with version 8.12, this mode is generally preferred for performing mass mailings of this variety. In general, interactive mail delivery greatly resembles the processes involved in relaying email messages, so almost everything said so far about relaying applies to this situation as well. The main distinction is that not only is the relaying ...

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