[TAG] Using DNS blacklists to reject mail.

[Joey Prestia]

Michael Makuch wrote:

> Initially I used a long list of DNSBLs including spamhaus, abuseat, 
> njabl, blitzed, dsbl,
> ordb, JAMMConsulting and uceprotect. But over time I have shortened that 
> list and I
> currently only use zen.spamhaus.org.
> 
> I recommend DNSBL. I wish that many more ISPs would use DNSBLs as I
> think they would work even better.
> 

So using multiple DNSBL's together is relatively safe. I have heard that
using zen.spamhaus.org is not recommended for users using SMTP
Authentication on their server as it might block the roaming users from
authenticating.

Although I would think that perhaps the priority of the lines in the
configuration of sendmail could be arranged so as to allow users that
authenticate to bypass any ruleset?

Actually I would think that authenticated users could bypass such rules
regardless just as they do in order to relay?

Best,

-- 
Joey Prestia
L. G. Mirror Coordinator
http://linuxamd.com
Main Site http://linuxgazette.net