>                                              I know that subdomains may begin
>with a digit now but I don't see anything to make the underscore legal.
>The definitions talk about  ldh-str (letter digit hyphen).
 
If it were ldhu-str (letter digit hyphen underscore) then it would be legal :-)
 
RFC1035 contains the definition of DNS names.  Looks like FAL is perfectly
justified in what it's doing.
 
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Mark J Strawcutter                           BitNet:    MJSTRAW@IUP
Director, Systems and Communications         DNS (mx):  [log in to unmask]
Indiana University of Pennsylvania           Voice:     (412) 357-4000
Indiana, PA   15705                          "you can't nail jello to a tree"