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http://www.exim.org/bugzilla/show_bug.cgi?id=428
graeme@??? changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|4.63 |4.67
------- Comment #3 from graeme@??? 2007-06-19 10:54 -------
Usage for ratelimit "/ noupdate" option:
In relevant ACLs, it's possible to lookup the existence of a specified (or
auto-generated) ratelimit key without incrementing the ratelimit counter for
that key.
Syntax:
warn ratelimit = rate / period / strict|leaky [/ noupdate] [/ options] [/ key]
In order to make use of it, another ACL entry *must* set the rate somewhere (or
the noupdate option is useless). In this case, the "/ per_cmd", "/ per_mail" or
"/ per_rcpt" options must be used or the previously precomputed rate from the
"/ noupdate" line will be used and no update will be done.
Example:
acl_check_connect:
# Read the rate; if it doesn't exist or is below the maximum
# we update it below
deny ratelimit = 100 / 5m / strict / noupdate
log_message = RATE: $sender_rate / $sender_rate_period (max
$sender_rate_limit)
[... some other logic and tests...]
warn ratelimit = 100 / 5m / strict / per_cmd
log_message = RATE UPDATE: $sender_rate / $sender_rate_period (max
$sender_rate_limit)
condition = ${if le{$sender_rate}{$sender_rate_limit}}
accept
In order to make proper use of this, it is important to set an appropriate key
as the last part of the ratelimit function. The precomputed key is of the form:
$ratelimit_period / strict|leaky / $sender_host_address
This is useful for the SMTP "connect" ACL, and perhaps others; to make use of
(for example) per-recipient ratelimits then it will be worth creating a
specific key which includes the relevant detail:
deny ratelimit = 100 / 5m / strict / per_rcpt / $local_part@$domain
message = This recipient is receiving messages too quickly.\
Please try again later.
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