RE: MTA mark draft

"Gordon Fecyk - Home" <[email protected]> Sun, 26 Oct 2003 12:55:47 -0600
Newsgroups gmane.ietf.asrg.rmx
Message-ID <[email protected]>
> get around the underscore problem --- some people don't like the
> underscore in _asrg_rmx / _smtp-client / _spf.

The underscore exists and it's used.  Just not for host names.  The most
visible use is in RFC 2872, adopted by Microsoft for distributing Windows
2000 authentication information in DNS.

It's there, and DNS servers understand it.  And other non-host-name
characters get used for DNS records too, like in RFC 2317.  I don't know of
a DNS implementation pre-BIND 4 that chokes on them.

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