On Thu, 02 Nov 1995 11:24:03 PST, Barton E. Schaefer said:
No, but RFC1123 specifies in sections 2.1 and 5.2.17 that domain literals
"whose content ... is a dotted-decimal host address" MUST be accepted by
mailers as a valid host identifier.
And this wording implies that other domain literals are at the mailer's
discretion. Note that it does *not* say that "mailers MAY NOT accept
domain literals whose content is NOT a dotted-decimal host address".
Valdis Kletnieks
Computer Systems Engineer
Virginia Tech