Milter-greylist

I speak about absolutly another thing :)
You speak about blocking by milter-greylist sender verification 
requests by Postfix or Exim or e.t.c.
This line in milter-greylist.conf can help:

...
from /<>/
...

Block bounce from <> is prohibited by many RFC & not help to war 
with spam, such messages is easy filter later...
Such spam is very little on volume, but block bounce may do big 
problems with succesful delivering process.

P.S. I speak about adding to milter-greylist technology like in Exim 
or Postfix to verify sender envelope. After successful verification 
do greylist in recipient envelope filter part as usually. Coz milter-
greylist don't protect against falsificated mail come from provider 
servers, that will try to deliver mail for 3-5 days :) Greylist is 
from 1 minute to 1 hour at sample. I use 1 minute, btw. It's enough 
for me.


--- In milter-greylist@yahoogroups.com, Matthias Scheler <tron@z...> 
wrote:
> On Wed, Nov 17, 2004 at 11:45:31AM +0300, ubr@o... wrote:
> > P.S. May be useful to enhance power of milter-greylist by 
> > adding real-time sender address callback verification?
> 
> Is real-time sender address verification what Postfix does to find 
out
> if a sender is valid? That trick and Milter Greylist don't like 
each
> very much. Milter Greylist blocks the verification and Postfix 
blocks
> the reception. It takes a while until they finally agree to 
exchange
> e-mails.
> 
> 	Kind regards
> 
> -- 
> Matthias Scheler                                  
http://scheler.de/~matthias/