On Fri, Aug 06, 2004 at 09:52:04AM -0400,
terry(_at_)ashtonwoodshomes(_dot_)com <terry(_at_)ashtonwoodshomes(_dot_)com>
wrote
a message of 49 lines which said:
As I just checked numerous Domain name registrars, including
NetworkSolutions, and non accept _ as a domain name character.
Probably because such a domain would be useless: no host names in it
would be legal. (We do not accept them in ".fr" either.)
But third-level domains with an underscore are much more common, see
_tcp.microsoft.com (Active Directory uses _tcp things).