On Mon, 13 Sep 1999, Randy Bush wrote:
> when, in fact, rfc2181, makes quite clear that there is no restriction on
> the characters used in domain names.
We've been through this on this list before (at least I think it was this
list).
The mail related RFCs do impose restrictions that DNS RFCs may or may not
impose. RFC 821 makes it very clear that underscores are not allowed. As
does the draft SMTP Update document.
This is from RFC821
<domain> ::= <element> | <element> "." <domain>
<element> ::= <name> | "#" <number> | "[" <dotnum> "]"
<mailbox> ::= <local-part> "@" <domain>
<local-part> ::= <dot-string> | <quoted-string>
<name> ::= <a> <ldh-str> <let-dig>
<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
<let-dig> ::= <a> | <d>
<let-dig-hyp> ::= <a> | <d> | "-"
-j
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