On 4/30/07 at 9:14 PM +0200, Arnt Gulbrandsen wrote:
Pete Resnick writes:
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
So, now I'm beginning to get uneasy about using SHOULD/RECOMMENDED in
here. If we want normative language like the above, we should really
just remove no-fold-quote (since quoted-string is already allowed in
the obs- syntax).
How about simply:
Note: There are contexts outside of Internet mail (specifically
Netnews [ref]) where message identifiers containing NO-WS-CTLs,
quoted-pairs, and specials on the left-hand side of the "@"
cause trouble for some implementations. Since messages
sometimes do traverse contexts, avoiding these on the left-hand
side of the "@" may be safest for implementations.
Pete Resnick <http://www.qualcomm.com/~presnick/>