I was under the impression that reverse DNS for the Internet was
essentially broken, due to several large ISPs not necessarily implementing
reverse DNS for their many subnetted customers.
With that in mind, with many customers using large ISPs for their public
DNS service, a updating the bounce back message might not resolve
anything, as the emailing site may not be in the authority to make the
changes you have requested, and the large ISP may not have the
wherewithall to implement such policies.
While I agree that the reverse lookup is trivial to set up and likely
should be setup, but it breeds complexity when outsourced to another
vendor for management.
SMiller@unimin.com
08/18/2004 04:49 PM
To
security-basics@securityfocus.com
cc
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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