On Wed, 21 Jun 2000 17:05:55 PDT, Joseph McDonald <[log in to unmask]>  said:

> If Listserv doesn't like the above setup, your best route would probably be
> to make your A record with the name "listserv.uic.edu" (and if you still
> want "machine1.uic.edu" to be in existence, make that one your CNAME).  Be
> sure to remove the MX record if you make "listserv.uic.edu" an A record.

Um. No. You *leave* the MX in there, as follows:

listserv.uic.edu.  MX 0 listserv.uic.edu.

This way, a remote host mailing to you will *GET* the MX record
on the first DNS lookup (it is *REQUIRED* to do an MX lookup first).
Any reasonable DNS server will also tack the A record for the machine
into the 'additional info' field of the DNS reply.  Thus, you get
the A record you actually want to send to on the FIRST query.

If you don't have an MX, then the remote site has to ask for the MX,
get a negative answer, and THEN ask for an A record.

Twice the DNS traffic.  You don't want that.

--
                                Valdis Kletnieks
                                Operating Systems Analyst
                                Virginia Tech