On Wed, 6 Dec 2006, Chris Lightfoot wrote:

> > ALL temporary errors become permanent if they persist for long enough. 
> > That's what timeouts are all about. Messages get bounced when servers 
> > are down for sufficiently long. I don't see why over quota errors are 
> > any different.
> 
> Of course, but that's up to the sender not the receiver.

Who is "the sender" when a message passes through several MTAs? Are you 
saying that only the originating MTA is allowed to apply timeouts?

> Would you announce a ``system is too busy'' or ``disk is
> full'' error as 500 just because it had persisted for
> longer than a threshold? 

Yes. "I have been trying to deliver your message for 5 days, but I cannot 
do so. Please return it to the sender. The most recent error I got was
'system is too busy'."

> If not, why is ``over quota'' any different?

It isn't. :-)

-- 
Philip Hazel            University of Cambridge Computing Service
Get the Exim 4 book:    http://www.uit.co.uk/exim-book

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