The default limit, if there is one, is defined by the MaxQueueRunSize option (?§24.9.72
on page 1050). But a separate limit that will override the default can be set for a
queue group using this J= equate. If the default is nonzero and if this equate specifies
zero, the default queues will have the default limit imposed but this group will have
none. This J= queue-group equate is used like this:
Jobs=number
If number is zero or negative, no limit is imposed. If number is positive, that will be the
maximum number of envelopes processed.
11.4.2.4 The Nice= (N=) queue-group equate
The niceness of a process determines its priority to be run. The larger the nice value,
the lower the priority. The default nice value varies from one version of Unix to
another. In all cases, however, they generally begin with the same nice value, so all
processes generally get an equal chance to run.
With sendmail, the niceness of its queue processors is set by the NiceQueueRun option
(?§24.9.80 on page 1059). If that option specifies a positive value, the priority is
reduced. If that option specifies a negative value, the priority is increased. In general,
queue processors should run at a lower priority so as to minimize the adverse impact
on other processes. On dedicated mail-sending machines, you might wish to increase
the priority.
Each queue group inherits its nice value from the NiceQueueRun option, unless this N=
queue-group equate is specified.
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