[CLUE-Tech] reverse DNS

[Charles Oriez]

At 10:15 AM 9/10/2004, Angelo Bertolli wrote:

>Can anyone explain to me why RDNS is important?  It's something that I've 
>never understood how it's useful to the way the Internet works.

as an anti-spam tool, rejecting traffic from servers without valid RDNS 
rejects a significant percentage of spam.  spam sent through 
trojaned  machines in particular tend not to have valid rdns



--

Charles Oriez     coriez at oriez.org    39  34' 34.4"N / 105 00' 06.3"W
**
"Drag God into politics, and you'll ruin his reputation in no time." -
Molly Ivins