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Re: Last Call: On-Demand Mail Relay (ODMR) to Proposed Standard

> While RFC 2181 clarifies the intent that the DNS resolution service can
> handle names containing arbitrary characters, it also recognizes that
> particular applications can constrain the form of name allowed.
> Specifically, RFC 1123 (sections and 2.1) and RFC 952 jointly
> indicate the restricted form indicated below as the valid form for Internet
> host names.

this is an ancient discussion.  careful reading will tell you that
'hostname' is not defind beyond the file hosts.txt which became obsolete
some years back.