Spam filtering and DNSBL, SBL/XBL?

[Bill Horne]

Scott Ehrlich wrote:

>My domain provider, pair.net, offers, among other features, the optional
>use of SA DNSBL and SA SBL/XBL for spam filtering.   I can enable/disable
>their use at-will.
>
>I have not heard of these methods before.  What are your experiences with
>them for handling spam?
>
>Thanks.
>
>Scott
>_______________________________________________
>Discuss mailing list
>Discuss at blu.org
>http://olduvai.blu.org/mailman/listinfo/discuss
>  
>
Scott,

DNSBL stands for DNS Block List, and they're very effective at 
preventing spam from reaching your machine.

If you enable one in Exim (for example), it will take the IP address for 
an incoming SMTP connect request, and do a DNS lookup via the DNSBL 
provider. If the IP is on the list, the block list provider returns a 
code (e.g., 127.0.0.6) that signifies the reason(s) you may choose to 
reject the HELO.

Bill



-- 
E. William Horne
William Warren Consulting
Computer and Network Installation & Service
http://www.billhorne.com/
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Fax:	781 784-0951