[COLUG] Effectiveness of Greylisting II

[Angelo McComis]

I use policyd - in addition to greylisting, it also offers highly configurable greylisting (user-based opt-in or opt-out of g/l-ing), throttles based on either quantity of size of messages, sender and/or domain-based whitelisting, and more.  Only downside is there is no GUI. Configuration is via a config file (startup options) and then MySQL for the backend.

But as Duane pointed out, broken captcha is a highly effective way of getting through greylisting.

-Angelo
  
-----Original Message-----
From: Joshua Kramer <josh at globalherald.net>

Date: Thu, 8 May 2008 14:49:14 
To:colug432 at colug.net
Subject: [COLUG] Effectiveness of Greylisting II



Howdy folks,

A while back, we discussed the effectiveness of greylisting:

http://www.colug.net/pipermail/colug432/2007-November/005043.html

I just turned on greylisting using the SQLGrey package:

http://sqlgrey.sourceforge.net/

I notice that my spam problem virtually vanished, with the exception of 
Phishing emails.  I guess since there's more 'gold' there, so to speak, 
the Phishers are more dilligent in making things work.

I'm curious, however, to see if my spam rate gradually increases, as Bill 
Yang reported in the thread noted above.  I wonder why this would be?  I'd 
think that given the population of spammers, they would either be in 
groups with non-conforming mail applications (those that greylists block), 
or conforming mail applications (that retry failed transactions).  I 
wouldn't expect that the population of spammers with me in their lists 
would smarten up to the fact that my particular address (out of their ten 
million) is bouncing...

-- 

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