Null MX records

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http://serverfault.com – The IETF appears to have had a draft to specify a null mx record whereby a domain would not handle mail and mail delivery systems would fail and return a undeliverable system immediately by directing a domain's only MX record to '.' (c/f http://tools.ietf.org/html/draft-delany-nullmx-00) Is this draft specification followed by most mail servers out there and worth setting up? Alternately, what's the best way to configure mail to not be delivered for a domain in the process of deprication? (HowTos)