I'm a bit confused what you're aiming to do here.  If you want to limit 
the number of connections/messages by an outside sender to your mail 
gateway, then the setup in the "sender throttle" section is relevant,
in particular, the settings:

SENDERTHROTTLE=1
SENDER_THROTTLE_SASL=0
SENDER_THROTTLE_HOST=1
QUOTA_EXCEEDED_TEMP_REJECT=1
SENDERMSGLIMIT=500
SENDERRCPTLIMIT=3600
SENDERQUOTALIMIT=250000000
SENDERTIMELIMIT=1h

as well as several other related settings; here, a limit of 500 messages 
and a maximum aggregate total of 3600 recipeints (among all the sender 
envelopes) will trigger the throttle.  And, yes, this can be done with the 
postfix "anvil" mechanism, but if you have multiple SMTP mail gateways, 
each one has to track limits with its own local postfix instance, while 
policyd will allow multiple SMTP agteways to access a common database and 
poll a combined set of values to base decisions on.


On the other hand, if you want a particular recipient to only be able to
receive/send  N messages per T time interval, the settings in the 
"recipient throttle" section pertain.

On Wed, 29 Aug 2007, am.lists wrote:

> Recently, I was emailing a system admin at one of the major ISPs. He
> told me that we were blocked for going over their throttle limits,
> which he described as 10 simultaneous connections per IP and 100
> messages per hour.
>
> Now. I use policyd 1.8x and know that I can do the #/per hour part,
> but how do I limit the number of inbound connections? Is that more at
> the Postfix level? I run in a distributed environment (one primary
> MySQL db), how do I enforce a connection limit across the environment?
>
> Thanks...
>
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