* Bob Beck  [2007-05-24 08:22]:

quoted text
> > rfc 2821 specifically forbids this behaviour.

> >

> > 

> > The DATA command can fail at only two points in the protocol exchange:

> >

> >    -  If there was no MAIL, or no RCPT, command, or all such commands

> >       were rejected, the server MAY return a "command out of sequence"

> >       (503) or "no valid recipients" (554) reply in response to the DATA

> >       command.  If one of those replies (or any other 5yz reply) is

> >       received, the client MUST NOT send the message data; more

> >       generally, message data MUST NOT be sent unless a 354 reply is

> >       received.

> >

> >    -  If the verb is initially accepted and the 354 reply issued, the

> >       DATA command should fail only if the mail transaction was

> >       incomplete (for example, no recipients), or if resources were

> >       unavailable (including, of course, the server unexpectedly

> >       becoming unavailable), or if the server determines that the

> >       message should be rejected for policy or other reasons.

>

> and that paragraph says right there, the server can decide it doesn't

> have the resources to deal with it. no problem.  The RFC does not

> forbid it

yes, but not in response to the DATA command (what I was talking about)

but after.
> and 821 (which ain't dead yet) allows explicitly in the state transactions.

quoted text
> 2821 is simply vague. 

well, 2821 is somewhat vague, 821 is kinda the definition of vague :)
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