HP-UX Mailing Services Administrator's Guide (B2355-91064)

Using queuegroups Through the access Database
To select queue groups easily based on recipient addresses or recipient domains, you
must use the gen_cf main menu option to use the queue group feature.
After enabling the queuegroup feature, you must add lines such as the following to
the source file for your access database:
QGRP:slow-poke.com slowgroup
QGRP:[e-mail] fastgroup
QGRP:your.domain localgroup
Queue Group Limitations
You can define the default queue group (mqueue) using the options and the command
line. If the Q configuration command does not have an equate, the queue group inherits
the property defined by the default queue group. Following are the default queue
group properties:
• DeliveryMode option
• FastSplit option
• MaxQueueChildren option
• MinQueueAge option
• -qI,-qR, and -qS command-line switches
• QueueFactor, QueueLA, RefuseLA and RecipientFactor options
• QueueFileMode option
• Timeout, queuereturn and Timeout.queuewarn options
These properties do not have equivalent equates. All queue groups inherit these
properties. You cannot override these properties with a queue-group equate.
Connection Caching
While processing a queue in the IPC and LPC connections, Sendmail retains the last
few open connections in open state to avoid startup and shutdown costs.
While attempting to open a connection, Sendmail searches the cache. If Sendmail finds
an open connection, it sends an RSET command to probe whether the open connection
is still active. If this fails, it is not considered an error; instead, the connection is closed
and re-opened.
The following parameters control the connection cache:
• The ConnectionCacheSize (k) option defines the number of simultaneous open
connections that are permitted. If this option is set to 0 (zero), connections are
closed as quickly as possible. This value limits the amount of system resources
that Sendmail uses during queue runs. The default value is one. You must set this
The Sendmail Utility 31