Date:  Sat, 20 Oct 2007 13:48:49 -0500
From:  madodel <madodel at ptdprolog.net>
Subject:  [VOICENWS] SW: Greylisting deamon: Hermes & libspf2

++ From the VOICE OS/2-eCS News Service   http://www.os2voice.org ++

From: Yuri Dario <mc6530DESPAM at DESPAMmclink.it>

Hermes is an SMTP proxy. We developed hermes for our own use on ITEISA, and 
we have perfected it with new features to cover our own needs. It is now 
being made public on the hope that it will help others to stop spam the 
same way it does for us everyday.  What makes it special is that it can be 
used to stop spam using a combination of the following techniques:

SMTP banner delay
     Most spammers will start sending data as soon as the connection is 
open, without waiting for the SMTP banner. What we do is delay this banner 
and if we have data waiting before we print it, we drop the connection.

Throttling
Hermes will process incoming SMTP commands at a slow pace. Most spammers 
have very little patience, so they will stop sending an email if it's 
taking too long to deliver.

Greylisting
     Greylisting is a process that will delay incoming mails for some 
minutes before allowing them to be delivered. As most spammers will not 
resend their messages, you will not receive them. If you want a more 
technical description, scroll down to read a greylisting description.

DNSBL
     As of hermes 1.2 you can now configure hermes to reject emails coming 
from ips listed on your favourite DNSBL, using the rbl_domain option.

libspf2 implements the Sender Policy Framework, a part of the SPF/SRS 
protocol pair. libspf2 is a library which allows email systems such as 
Sendmail, Postfix, Exim, Zmailer and MS Exchange to check SPF records and 
make sure that the email is authorized by the domain name that it is coming 
from. This prevents email forgery, commonly used by spammers, scammers and 
email viruses/worms.


The latest OS/2 build for Hermes (and libspf2) can be found here:

http://web.os2power.com/yuri/Hermes

Since this software is ported for free, donations are welcome! you can use 
PayPal to donate me and support OS/2 developement. If you like to sponsor 
current OS/2 software developement, follow instructions at 
http://web.os2power.com/yuri/HomePage

Thanks,

Yuri Dario

-- 

  Warpstock 2007 - Toronto, Ontario, Canada: http://www.warpstock.org
  Warpstock Europe - Valkenswaard close to Eindhoven, the Netherlands: 
http://www.warpstock.eu

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