Re: educating rDNS violators

[Eric Brown <ericbrow () ziplip com>]

Hello all,
I will admit, I thought I knew enough about DNS to get it working.  I managed to send and recieve mail to myself from 
all the domains I managed.  I could get to the right website.  I ran into a domain that did exactly as Scott mentions 
here.  The sysadmin for this domain was no help at all, and quite rude about it.  It turned out it wasn't a problem 
with my DNS servers, but my upstream provider.  They had to add a PTR entry to their DNS, so that all of our class C 
IP's mapped back to us.

I'm certain that I don't know all I should about being a sysadmin.  I do know I enjoy it a lot.  I think this list is 
one of the best places to educate people like myself.

That's my 2 cent anyway.
Eric

> -----Original Message-----
> From: SMiller () unimin com [mailto:SMiller () unimin com]
> Sent: Monday, August 23, 2004, 9:51 AM
> To: security-basics () securityfocus com
> Subject: educating rDNS violators
>
>
>
>
>
> Our mail administration group recently implemented blocking of all incoming
> messages from domains that cannot be resolved via reverseDNS, for purposes
> of spam prevention.  Of course, there are quite a number of legitimate
> business contacts who do not have rDNS properly configured.  Assuming that
> the rDNS criterion remains, the question becomes one of who will notify
> and/or educate the sender(s) about this issue.  The only time-efficient way
> that I can think of to do this would be to have instructions and references
> in the body of the bounce message itself.  Anyone tried that?  Results?
> Other suggestions?  Thanks in advance.
>
> Scott
>
>
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are guaranteed to be 12 students or less to facilitate one-on-one
interaction with one of our expert instructors. Gain the in-demand skills of
a certified computer examiner, learn to recover trace data left behind by
fraud, theft, and cybercrime perpetrators. Discover the source of computer
crime and abuse so that it never happens again.

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