Alexey Melnikov wrote:
> RFC 821 allowed for space characters (0x20) in local part of
> email addresses, but RFC 2821 and 2821bis don't allow for that
| <quoted-string> ::= """ <qtext> """
| <qtext> ::= "\" <x> | "\" <x> <qtext> | <q> | <q> <qtext>
[...]
| <q> ::= any one of the 128 ASCII characters except <CR>, <LF>, quote ("),|
or backslash (\)
That allowed NO-WS-CTL, SP, and NUL in a <quoted-string> *outside* of a
<quoted-pair>
>
> Local-part = Dot-string / Quoted-string
> ; MAY be case-sensitive
>
> Dot-string = Atom *("." Atom)
>
> Atom = 1*atext
>
> Quoted-string = DQUOTE *qcontent DQUOTE
>
> where qcontent is defined in RFC 2822 as:
>
> qtext = NO-WS-CTL / ; Non white space controls
> %d33 / ; The rest of the US-ASCII
> %d35-91 / ; characters not including "\"
> %d93-126 ; or the quote character
>
> qcontent = qtext / quoted-pair
>
> NO-WS-CTL = %d1-8 / ; US-ASCII control characters
> %d11 / ; that do not include the
> %d12 / ; carriage return, line feed,
> %d14-31 / ; and white space characters
> %d127
>
> Was this change between RFC 821 and RFC 2821 intentional? Prohibition of
> spaces in quoted parts breaks gatewaying to/from X.400 (MIXER, RFC 2156).
>
> Regards,
> Alexey
>
>
