My own preference is to store the new information in TXT record(s) in a
distinguished subdomain. For example, one might use the TXT records in
the '_rmx' subdomain of the domain in question: rather than querying for
the records of type RMX in domain domain.com, one queries for the
records of type TXT in the domain _rmx.domain.com.
Have you seen Fecyk's proposal? It's at:
http://ietfreport.isoc.org/ids/draft-fecyk-dsprotocol-02.txt
It's very much along those lines. There is a link to it at the bottom of
my RMX records page.
Mike
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