If you don??™t,
the number that you specify is interpreted by default as a number of minutes. The wait
should never be longer than five minutes. A value of 0 essentially turns off caching.
Beginning with V8.13, this option affects delivery agents that receive messages using SMTP
over the standard input/output (that is, with P=[LPC]).
This ConnectionCacheTimeout option has an effect only if the ConnectionCacheSize option
(?§24.9.20 on page 987) is also declared.
The ConnectionCacheTimeout option is not safe. If specified from the command line, it can
cause sendmail to relinquish its special privileges.
24.9.22 ConnectionRateThrottle
Incoming SMTP connection rate V8.8 and later
Whenever an outside site connects to sendmail??™s SMTP port, sendmail fork(2)s a copy of
itself. That copy (the child) processes the incoming connection and its message. The
primary load-limiting mechanisms are the QueueLA (?§24.9.91 on page 1072), RefuseLA
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
24.9 Alphabetized Options | 989
(?§24.9.96 on page 1078), and DelayLA (?§24.9.33 on page 1002) options. However, these
options rely on the system load average, which can generally be sluggish and can lag behind
events. This ConnectionRateThrottle option, and similar options, exist to help flatten out
the actual load until the load average can catch up.
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