Hello,
On Wed, Dec 06, 2006 at 09:40:31AM +0000, Chris Lightfoot wrote:
> On Wed, Dec 06, 2006 at 09:28:12AM +0000, Philip Hazel wrote:
> > On Tue, 5 Dec 2006, Chris Lightfoot wrote:
> >
> > > The classic example is errors indicating that the user's
> > > mailbox quota is overrun. This is of course a temporary
> > > error, not a permanent one,
> >
> > How do you know it is a temporary error?
>
> Because a future attempt with the same sender, receiver
> and message data may succeed. RFC 2821:
>
> | A rule of thumb to determine
> | whether a reply fits into the 4yz or the 5yz category (see below)
> | is that replies are 4yz if they can be successful if repeated
> | without any change in command form or in properties of the sender
> | or receiver (that is, the command is repeated identically and the
> | receiver does not put up a new implementation.)
>
> `Over quota' is no more a permanent error than `disk full'
> or `load average too high'. It's certainly true that (a)
> the error condition could persist indefinitely, and (b) if
> it persists for too long the failing message should be
> returned to its sender, but that's a decision for the
> sender, not the recipient.
The decision whether a failure is temporary or permanent is not up to
you but up to the server that sends the response.
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