WKD lookup

[Peter Lebbing]

On 04/11/16 21:16, Werner Koch wrote:
> Strip everyting up to and including the first '@' from the (UTF_8
> encoded) addr-spec.

This is perhaps not as RFC 5321 specifies e-mail addresses[1]. I see:

-----------------------8<--------------->8-----------------------
   Mailbox        = Local-part "@" ( Domain / address-literal )

   Local-part     = Dot-string / Quoted-string
                  ; MAY be case-sensitive


   Dot-string     = Atom *("."  Atom)

   Atom           = 1*atext

   Quoted-string  = DQUOTE *QcontentSMTP DQUOTE

   QcontentSMTP   = qtextSMTP / quoted-pairSMTP

   quoted-pairSMTP  = %d92 %d32-126
                    ; i.e., backslash followed by any ASCII
                    ; graphic (including itself) or SPace

   qtextSMTP      = %d32-33 / %d35-91 / %d93-126
                  ; i.e., within a quoted string, any
                  ; ASCII graphic or space is permitted
                  ; without blackslash-quoting except
                  ; double-quote and the backslash itself.
-----------------------8<--------------->8-----------------------

atext is defined in RFC 5322: [2]

-----------------------8<--------------->8-----------------------
 atext           =   ALPHA / DIGIT /    ; Printable US-ASCII
                       "!" / "#" /        ;  characters not including
                       "$" / "%" /        ;  specials.  Used for atoms.
                       "&" / "'" /
                       "*" / "+" /
                       "-" / "/" /
                       "=" / "?" /
                       "^" / "_" /
                       "`" / "{" /
                       "|" / "}" /
                       "~"
-----------------------8<--------------->8-----------------------

This seems to suggest the following e-mail addresses:

"Peter at work"@example.org
"Unmatched\"@messing-with-you"@example.org

It would also seem to suggest that people doing this deserve not being
able to receive e-mail ;-).

HTH,

Peter.

[1] https://tools.ietf.org/html/rfc5321#section-4.1.2
[2] https://tools.ietf.org/html/rfc5322#section-3.2.3

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