Hi Grant,
I'm using postfix and a very good sets of pcre rules which takes care of
more than 90% of all spam.
Spamassassin will do the rest. The only spam I receive is on my postmaster
account.
Postfix uses greylisting, a set of rbl lists and a pcre rule set op the helo
check and client_access_check.
At this moment I'm blocking all ips belonging to customers of cable and adsl
networks, because there are the most botnets.
The helo_checks at this moment are:
/^[0-9.]+$/ REJECT Please use your ISP's outgoing mail server - HA
/^\|/ REJECT Please use your ISP's outgoing mail server - HB
/^[\d\.]+$/ REJECT Please use your ISP's outgoing mail server - HC
# H1 adsl,dial, dhcp, cable, retail, dynamic in hostname
/(adsl|dial|dhcp|cable|retail|dynamic)/i REJECT Please use
your ISP's outgoing mail server - H1
# H2 customer, dial, local, static in hostname
/(customer|local|static)/i REJECT Please
use your ISP's outgoing mail server - H2
# H3 1234
/\d{4}/ REJECT
Please use your ISP's outgoing mail server - H3
# H4 123-123-123
/\d{1,3}-\d{1,3}-\d{1,3}/ REJECT Please use
your ISP's outgoing mail server - H4
# H5 123.123.123
# /\d{1,3}\.\d{1,3}\.\d{1,3}/ REJECT Please use
your ISP's outgoing mail server - H5
Untill now no false positves!
So, first take a very good look to your MTA!
Jack
----- Original Message -----
From: "Grant Peel" <[EMAIL PROTECTED]>
To: <freebsd-questions@freebsd.org>
Sent: Friday, April 20, 2007 6:43 PM
Subject: Anti Spam
Hi all,
I am posting this question here because I know there are alot of ISPs using
FreeBSD (including me) and am hoping to get feedback, either directly to me
or to the list.
We are wrestling (as I am sure many are), with spam. Up until now we have
been employing Spamassassin locally and using some 3rd party Anti-Spam
servervices that are getting less and less reliable as the weeks go by.
We are considering two hardware solutions, Easyantispam and Barracuda.
Barracuda is very expensive, so the most likely candidate is Easyantispam.
Does anyone out there have thought on either or both of these? Usability?
Reliability? Total Cost of ownership? Integration issues?
Any thoughts will be appreciated,
-Grant
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