On Fri, Mar 8, 2013 at 2:56 PM, Michael Fischer v. Mollard
<[email protected]> wrote:
>
> Hello,
Hi!
>
>
> there is a strange difference in Exim's handling of empty local parts
> »@example.net« and »""@example.net«:
>
> mail from: <>
> 250 OK
> rcpt to:<@example.net>
> 501 <@example.net>: no local part
> rcpt to:<""@example.net>
> 250 Accepted
>
> I would have expected that the latter address gives an "501 no local part" as
> well. Is this intentional or a mistake?
It is standards compliant.
The local-part of an e-mail message (I'll stick to RFC 2821 now) must follow:
Local-part = Dot-string / Quoted-string
Whereas a Dot-string must have at least one character (Dot-string =
Atom *("." Atom)), the Quoted-string has other requirements:
Quoted-string = DQUOTE *qcontent DQUOTE
This means that the Quoted-string must consist of a double quote,
followed by zero or more qcontent expressions, followed by a double
quote.
If there are zero qcontent expressions, you end up with:
""@example
--
Jan
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