Re: [PLUG] Postscreen (another tool for helping to minimize the effect of spam)

[ac <ac@main.me>]

On Mon, 24 Oct 2016 16:06:25 -0400 (EDT)
"Keith C. Perry" <kperry@daotechnologies.com> wrote:
> First I've heard of postscreen (and now postgrey- thanks) so I'll
> have to see how it goes in the wild.
> 
I use it, yes it is cool but it is somewhat less effective these days as
bots also deal with delays now. It has a higher overhead but is still
very effective in smaller email clusters, like an other expert said,
it depends on your environment, how many physical mail servers you
have, where they are, etc etc. - in larger clusters, not so much, there
are lower overhead ways, like basic checks (no dns, etc) larger
clusters you still need to build to fit a suitable greylisting design
as each requirement is always different and any overhead/delays/etc is
not that good/acceptable

1c

Andre 

> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 
> Keith C. Perry, MS E.E. 
> Owner, DAO Technologies LLC 
> (O) +1.215.525.4165 x2033 
> (M) +1.215.432.5167 
> www.daotechnologies.com
> 
> ----- Original Message -----
> From: "Rich Freeman" <r-plug@thefreemanclan.net>
> To: "Philadelphia Linux User's Group Discussion List"
> <plug@lists.phillylinux.org> Sent: Monday, October 24, 2016 3:55:34 PM
> Subject: Re: [PLUG] Postscreen (another tool for helping to minimize
> the effect of spam)
> 
> On Mon, Oct 24, 2016 at 2:47 PM, Keith C. Perry
> <kperry@daotechnologies.com> wrote:
> > For what its worth, Zimbra 8.7 has built in Postscreen
> > functionality (since it is part of Postfix) and they have nice
> > write up on it at:
> >
> > https://wiki.zimbra.com/wiki/Zimbra_Collaboration_Postscreen
> >
> > The main, Postfix man page is here:
> >
> > http://www.postfix.org/postscreen.8.html
> 
> Interesting.  I'm currently running postfix and postgrey.  How much of
> a drop-in is postscreen, or do you really need to tweak the config to
> have it work "correctly?"  Does it offer many benefits compared to
> postgrey?  Postgrey also does the whitelisting but the test consists
> simply of dropping every connection with a temporary failure and
> seeing if the host bothers to try again later.
> 
> It looks like you want it to only filter inbound mail from the
> internet.  That isn't a big deal since that all comes in through a
> gateway anyway, so I can just have it go to a dedicated postscreen
> port.
> 

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