How can MailScanner "push back"?

[Hugo van der Kooij]

On Thu, 23 Aug 2007, Leland J. Steinke wrote:

> Has anybody set up a scheme where MailScanner tells the MTA to stop or slow 
> message acceptance, short of blocking inbound port 25, when message scanning 
> gets too far behind?
>
> We use postfix (so I will try not to reply to my own message).  I have been 
> playing with the idea of tuning the number of inbound smtpd processes in 
> master.cf to match the capacity of the MailScanner instance running on the 
> underlying hardware.  The initial results are not particularly encouraging. 
> Even with in-house RBLs and reduced spam-score thresholds for RBL addition, 
> some of our servers are being overrun with apparent StormWorm emails from IPs 
> all over the map, reducing the RBL's effectiveness.

Considering blocking DSL, cable and other 'user' IP ranges. There are some 
RBL's focussing on these ranges. It should give you some air.

Hugo.

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