Arnt Gulbrandsen wrote:
I'd rather stick with the liberal syntax for now, and maybe add a note
that says, "You SHOULD be conservative in what you generate, as
NO-WS-CTLs, quoted-pairs, and specials are known to cause heartburn
in some environments (cf. USEFOR)."
+1. Proposed text: «It is RECOMMENDED to use only A-Z, a-z, 0-9, ".",
"." and "/" on the left-hand side, and to make the left-hand side at
most 64 characters long. Unusual but permitted syntax such as (for
example) quoted-pairs are known to cause problems in some contexts.»
Where's the evidence that NO-WS-CTL is implemented AND interoperable ?
It's IMO harmful and a showstopper for DS. It can't pass any gateway
to NetNews if used in Message-IDs.