Instead, it only
looks at the filename for its sorting or randomizing order. On the downside, this prevents
sendmail from grouping messages for optimum delivery. On the upside, this
reduces the time to preread a huge queue from 20 or so minutes to less than 2
seconds.*
The QueueSortOrder=random (?§24.9.92.5 on page 1074) is just like the QueueSort-
Order=filename shown earlier, except that it randomizes the list before beginning
delivery. This method is preferred, but is only available beginning with V8.12
sendmail.
After draining the full queue to a more manageable level, you can discontinue this
special process and rerun sendmail in its normal manner.
If the full queue has to remain in service while the full state is being solved, you can
use the techniques in ?§11.9.1 on page 437 to move that full queue out of the way so
that it can be processed in the background.
11.4 Queue Groups (V8.12 and Later)
As of V8.12 sendmail, it is possible to group queues according to selected criteria,
and then to process each group with custom settings. This versatile ability is enabled
and tuned with:
??? The QUEUE_GROUP mc configuration command, which defines queue groups
and sets their group properties
??? Th eFEATURE(queuegroup), which allows you to select queue groups based on
recipient hosts via the access database
??? More sophisticated queue group selections, which you can make by writing your
own rule sets
* As measured on a 300 MHz Intel machine running Berkeley Software Design Inc.
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