What are the issues with regard to a server being out of compliance with
section 3.3.9 of RFC 1035?  Is there a security issue, or some real-world
issue other than the fact that RFC's clearly specify that the target of an
MX record must be a name rather than an IP address?

If this is a BOFH issue, is there a patch for courier, or a switch somewhere
that I might use to allow acceptance of non-compliant email?

It doesn't appear that from a functional point of view it should matter that
an MX record uses a number rather than a name, although I may not understand
all the issues involved and don't know why the RFC is so specific in this
regard.

Any insight would be appreciated.  I have a customer who is unhappy because
one of his his correspondants can't reach him and the ISP with misconfigured
DNS is both unresponsive and probably the only ISP available for many people
in the community in which it's located.

-- 
Lindsay Haisley       | "Everything works    |     PGP public key
FMP Computer Services |       if you let it" |      available at
512-259-1190          |    (The Roadie)      | <http://www.fmp.com/pubkeys>
http://www.fmp.com    |                      |


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