Creating a CNAME on DNS Windows 2003 server

I am trying to create a cname for an MX Record on a windows 2003 dns server and I keep getting the following error
error message "An alias (CNAME) record cannot be added to this DNS name.
The DNS name contains records that are incompatible with the CNAME record."
What is going on?
Any help is appreciated.

Juan
jibarraAsked:
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CaseybeaConnect With a Mentor Commented:
It's a limitation of DNS.   You cannot create a CNAME (alias) record that points to anything other than a true HOST name.    An MX record is not a true HOST name.  It's a special resource record type.

This is not just a limitation of Windows DNS-- this applies to BIND as well.

You CAN, however, create multiple MX records to point to various other hosts and so on.
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