[CLUE-Tech] reverse DNS

[Adam Bultman]

Well, it doesn't really 'keep it in check' unless you are specifically 
denying the ability of people without RDNS to send you mail, like AOL does.

RDNS is *meant* to assist with things like mail, etc so that you can 
trully 'know' where mail is coming from. Unfortunately, very few people 
actually deny mail based on RDNS info because you'll be blocking too 
many people.

For mail, SPF is the next big thing...

Adam

William wrote:

>Simply put, it serves something like an ID card for your host.  Additionally, thanks to the
>delegated nature of DNS and who controls the DNS servers, it is much more difficult to spoof than,
>say, an SMTP HELO response.  I can't say how many thousands of hits I get against my servers ever
>day that 'claim' to be one host, when their RDNS lookup indicates who they truly are -- usually
>dial-up, cable, and DSL users, all from dynamic IP beds.  Spoofing is rampant, and RDNS help to
>keep it in check.
>
>
>--- Angelo Bertolli <angelo at freeshell.org> 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.
>>
>>Angelo
>>
>>
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>
>
>=====
>William Kimball, Jr.
>"Programming is an art form that fights back!"  =)
>
>
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