sendmail, 4th Edition

Queue Group Limitations

As you saw in The Default Queue Group on page 409, the default queue group (mqueue) is defined by options and the command line. If any given Q configuration command is missing a given equate, that queue group inherits that property as defined by the default queue group. There are, however, properties for the default queue group which have no equivalent equates. These properties are inherited by all queue groups and cannot be overridden with a queue-group equate. They are:

DeliveryMode option

If the DeliveryMode option (DeliveryMode on page 1004) is set to queueonly or deferred, all mail will be queued rather than delivered. This affects all queue groups.

FastSplit option

This FastSplit option (FastSplit on page 1032), when nonzero, prevents MX lookups prior to splitting an envelope and limits the number of envelopes that can be delivered on the initial attempt. This option, regardless of its value, affects all queue groups.

MaxQueueChildren option

The MaxQueueChildren option (MaxQueueChildren on page 1049), when nonzero, limits the number of queue processors that can simultaneously run across all queues. If this is fewer than the total queue runners across all queue groups, it limits the run to this setting. Any queue groups that are not run are handled in the next run in round-robin order. There is no way to limit some queue groups and not limit others.

MinQueueAge option

Messages in a queue are processed no more often than the interval set by this MinQueueAge