Command: subinterval

  Format: subinterval <time>

Sets the submission interval, which is the period of time during which
the "floodlimit" list parameter applies to submissions.  This feature is
provided to prevent inadvertent or malicious flooding of your list by
users or mail-generating programs.

Essentially, a subscriber is considered to be a flooding if "floodlimit"
(or more) submissions arrive from that subscriber within "subinterval"
time.  The time is composed of a number and letter.  The letter
possibilities are as follows: w (week), d (day), h (hour), m (minute) and
s (second).  These can be used in any combination for the desired effect.
For example:

	subinterval 12w6d

This would ensure that after a single submission to your list, each
subscriber may send at most "floodlimit" submissions (including the first
one) to your list in a period of 12 weeks and 6 days before being able to
submit again, effective immediately.  By extension, 12w6d is the same as
90d, and so on.  A value of "none" or "0" disables this feature.

A submission that exceeds "floodlimit" before the interval ends will be
handled according to the value of the "flood" parameter.  See the help file
on "flood" for details.

Note that this only takes effect on people who are subscribed to the list.
If you allow submissions from outside (i.e. the list isn't private) and don't
have the "auto-subscribe" flag set, there's no record kept of when a
non-member sent something to the list and thus non-members are exempt from
this restriction.  Thus, it doesn't make much sense to use this without
either the "private" or "auto-subscribe" list flag enabled.

CAUTION:  If you use this feature, and have the "flood" parameter set in
"defer" mode, beware that this setting does not exceed the timeout values
for the mail transport system.  Contact your system administrator for details.
For example, if the mail transport system rejects a message if it is
undeliverable for one week and you set a submission interval of 10 days,
a submission delayed by this feature will probably be returned to the sender
by the mail transport system before distribution takes place.  Also, the
mail transport system might send "undeliverable" warnings back to the sender
due to the imposed delay.

You must be a list owner to use this command, and must have previously
selected your list with the "select" command.

See also: auto-subscribe flood floodlimit private select
