How can MailScanner "push back"?

[Leland J. Steinke]

Michael Huntley wrote:
> Greylisting stopped a terrible mail storm on our system. 

We've been using sqlgrey for almost 18 months now.  The spammers have 
adapted.

Hugo van der Kooij wrote:
 > Considering blocking DSL, cable and other 'user' IP ranges. There are
 > some RBL's focussing on these ranges. It should give you some air.

We use PSBL and DSBL, in addition to our own RBL.  We are an ISP, so I 
am loath to use RBLs such as PBL to reject connections, instead using 
them in SA to jack up spam scores.

Maybe I need to write a postfix policy daemon to query the hold queue or 
otherwise check the box's status and 450-reject the connection if the 
box is overloaded...


Leland