On Mon, 14 Apr 1997, Tom Samplonius wrote:
> The unknown mailbox code is 550, not 553. 553 is used if there is
> something wrong with the mailbox name (ie syntax incorrect). It makes
> sense that Exim would freeze such messages, as presumable the syntax could
> be fixed.
Exim pays attention only to the first digit of SMTP reply codes. It does
not try to be clever and do different things for different values. 5xx
is a hard error; it can't deliver the message to its recipient. Because
it is a delivery error message, it can't return it to sender either.
Therefore it freezes (though there is an option to cause it to discard).
--
Philip Hazel University Computing Service,
ph10@??? New Museums Site, Cambridge CB2 3QG,
P.Hazel@??? England. Phone: +44 1223 334714
