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sendmail Performance Tuning by Nick Christenson

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5.3. Draining Queues

At the outset, I should point out that this third strategy for the mass mailing of files is the one I recommend least. It would be very easy to get a little sloppy with this method and cause a considerable amount of heartache, either in terms of work that needs to be redone or in the creation of an email mess for the intended recipients of the messages. The reader should consider this method to be included primarily for completeness.

Another option to consider for mass mailing is to precreate sendmail qf and df files in directories (queues) and, when the appropriate time to send comes, run sendmail -q -oQ/path/to/directory to drain the queues. This strategy requires a solid knowledge of the format of the qf files, which ...

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