Re: Cannot Send Mail To One Domain

[Bill Cole]

At 10:34 AM -0600 11/16/02, Michael A. Pasek imposed structure on a stream of electrons, yielding:

In SIMS Digest #1853, Bill Cole <[EMAIL PROTECTED]> wrote:

I wonder if it might not be because the reverse DNS for your mail
server's IP address is bad? It seems to be returning a CNAME instead
of a PTR, and the name in that CNAME does not resolve. That is wrong
2 ways. It should yield a PTR record pointing at a name that resolves,
preferably back to the same IP.

A CNAME for an IP address is the only way to do sub-delegation of address
blocks on non-octet boundaries.  See http://www.ietf.org/rfc/rfc2317.txt
for the "accepted" way to do this.  Of course, the CNAME should be able
to be resolved to a PTR.

I absolutely understand that, but in this case the CNAME is of completely wrong form for doing 2317-style classless delegation. It is outside the in-addr.arpa zone altogether. This bears no resemblance to broken delegation, it just looks like a case of an ISP that doesn't really know how to do DNS.

(That would be consistent with my experiences dealing with Telus)

--
Bill Cole [EMAIL PROTECTED]


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