Challenge to DNS experts
Prelude: Please read the following documents:
http://www.email-marketing.ca/#Types...ing%20Software
http://www.emailarchitect.net/webapp.../dnslookup.asp
http://gd.tuwien.ac.at/opsys/linux/g...e80/tag/2.html
Now, read http://www.4mktg.com/faq/online-help.html#6
Look at #2:
"If you find the success rate is unacceptably low, you might change the DNS server. Big ISP's always have powerful DNS servers. Write email to them for the DNS server IP address or use some software to sniff them by yourself."
Focus on "SNIFF them by yourself."
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Challenge:
Every single day we see stuff like the following in our logwatch results:
ns_forw: query(fresheoffers.com) All possible A RR's lame: 8 Time(s)
sysquery: query(mx.cherryslush.com) All possible A RR's lame: 9 Time(s)
And the like.
We strongly believe this is coming from SPAM organizations that have "sniffed" our DNS, and are trying to use our DNS servers to send out their SPAM.
How do we go at blocking them from using our DNS servers to send SPAM?
Thank you.
