On Fri, Mar 23, 2018 at 01:48:03PM +0100, Matthijs Mekking wrote: > Other candidates: MD, NXT, MAILA - They are obsolete too according to the > IANA DNS parameters. > > Also, if you want to deprecate MB, MG, you might want to consider > deprecating MAILB too.
There are a few more that are/were in use which are not even listed.
E.g, "A" was used outside IN class.
Mukund
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