The ConnectionRateThrottle option is
used like this:
O ConnectionRateThrottle=num ?†? configuration file (V8.8 and later)
-OConnectionRateThrottle=num ?†? command line (V8.8 and later)
define(`confCONNECTION_RATE_THROTTLE??, `num??) ?†? mc configuration (V8.8 and later)
The num is of type numeric. If it is present and greater than zero, connections are slowed
when more than that number of connections arrive within one second. If num is less than or
equal to zero, or absent, no threshold is enforced. If the entire option is missing, the default
becomes zero. The default for the mc technique is to omit this option.
To illustrate how the slowdown operates, consider a situation in which num is set to 3, and
12 connections come in simultaneously. The first three connections are handled immediately.
The next three are handled after one second. The three after that are handled after
two seconds, and so on. The twelfth connection would be handled after a delay of three
seconds.
Note that this option and the MaxDaemonChildren option (?§24.9.65 on page 1044) affect
incoming connections differently. Also see the DelayLA option (?§24.9.33 on page 1002) as a
way to delay incoming messages on high load.
The ConnectionRateThrottle option is not safe. If specified from the command line, it can
cause sendmail to relinquish its special privileges.
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