Sendmail 8.13.3 Release Notes (5900-1546, January 2011)

sorting is done for each delivery() pass, to determine piggybacking. The
significance of the change is better when the recipient list is large. hostsignature
is now created during recipient list creation rather than during delivery.
• The previous piggybacking called ‘coincidental’ is extended to a more opportunistic
piggybacking called ‘coattail’. Rather than complete MX record matching
(coincidental), piggybacking is done if just the lowest value preference matches
(coattail).
• New Queueing features implemented in Sendmail 8.13.3
Following are the new queueing features:
◦ All queue runners can be terminated using a SIGTERM to the parent.
◦ A new option, QueueFileMode, is added for the default permissions of queue
files.
◦ A new parallel queue runner code is added. It allows multiple queue runners for
each work group to process the same work. A work group is a collection of one
or more queues in a multi-queue environment.
◦ The MaxQueueChildren option is added to limit the number of concurrent
active queue runner processes.
◦ The MaxRunnersPerQueue option specifies the maximum number of queue
runners for each queue group.
◦ A queue member selection by substring pattern matching now allows the pattern
to be negated. For the options -qI, -qR and -qS, you can specify -q!I, -q!R,
and -q!S to remove members of the queue that match during processing.
◦ The -qp [time] option is added to fork a single child for each queue that
sleeps between queue runs. This option is similar to -qtime option that is used
to periodically fork a child to process the queue. You can send a SIGHUP signal
to restart this persistent queue runner.
◦ The SIGHUP signal now restarts a Sendmail process that runs the queue at an
interval of 15 minutes.
◦ The NiceQueueRun option sets the priority of queue runners.
◦ The -qf and -v option run the Sendmail queue in the foreground. Normally,
Sendmail runs the queue in the background when Sendmail is invoked with the
-q option.
Sendmail runs the queue in the background when Sendmail is invoked with -q
option. However, if you use the new -qf option or -v option, Sendmail runs
the queue in the foreground.
6 Sendmail 8.13.3 Release Notes