Regarding...
> In our tests, about 20% to 40% of legitimate E-mail is sent from a
> mailserver with no reverse DNS entry (oddly enough, probably
> about 1/2 of them have admins that swear that they do have
> a reverse DNS entry!). ......
> However, there are lots of smaller ISPs that don't understand
> reverse DNS, and a couple large Internet providers that don't
> set up reverse DNS entries unless asked.
My recent experience with XO Communications is right
in line with the above. It took three levels of
customer support before someone understood my
request for reverse DNS delegation to my name servers.
Then I found I had errored in my reverse DNS
configuration. I had incorrectly created the
reverse lookup zone. I had not accounted for the
CIDR block notation.
db
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