Re: DNS blacklists

["McClenon, Braden" <mcclenbw () ONEONTA EDU>]

Did you mean sbl-xbl.spamhaus.org?  We were using zen.spamhaus.org until our Barracuda’s internal “Pseudo-RBL” became 
good enough that querying Zen didn’t seem worth the look-ups anymore.

I found psbl.surriel.com to have too many false positives, and I’ve heard the same about spamcop.  I’ve heard others 
say psbl.surriel.com is good as part of a Bayesian scoring system though.  Honestly, I’ve only heard complaints about 
spamcop, but that’s not to say there aren’t supporters out there.

Also, cbl.abuseat.org is included in xbl.spamhaus.org.  See http://www.spamhaus.org/xbl/.  So you could get rid of that 
one.

 

Brady McClenon

Senior Server Administrator

SUNY Oneonta

 

From: The EDUCAUSE Security Constituent Group Listserv [mailto:SECURITY () LISTSERV EDUCAUSE EDU] On Behalf Of Ben 
Williams
Sent: Monday, May 18, 2009 1:19 PM
To: SECURITY () LISTSERV EDUCAUSE EDU
Subject: Re: [SECURITY] DNS blacklists

 

We utilize zen.spamhaus and b.barracuda. The only complaints we have received are from users being blocked when sending 
mail from home (POP/IMAP users). Where necessary we have added exceptions for them.

When we added the barracuda list our top spam recipients saw approximately a 50% decrease in quarantined spam. While 
that does not translate to a 50% reduction in spam for everyone, it certainly does lighten the load on our spam filter 
system.

 

Ben Williams

> > > "Tupker, Mike" <mtupker () MTMERCY EDU> 5/18/2009 12:38 PM >>>

Hi,

 

I was just curious what other campus’ are using in terms of DNS blacklist when it comes to email? They are very handy 
but recently a few of them have been the source of some complaints from our users. Currently we are using:

 

Rbl-xbl.Spamhaus

psbl.surriel.com

cbl.abuseat.org

bl.spamcop.net

dnsbl.njabl.org

Barracudacentral – by default in our barracuda device

 

I know we are probably using more lists than is necessary, but I’m sure you all know how cranky people can get if they 
find a single spam message in their inbox.

 

Mike Tupker

Systems Administrator

Mount Mercy College