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
The
FEATURE(queuegroup), which allows you to select queue groups based on recipient hosts via the access databaseMore sophisticated queue group selections, which you can make by writing your own rule sets
You can best tune queue groups by first understanding their limitations. We cover these topics in this section, but first we need to briefly discuss the default queue group.
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