valid incoming email. It is rare, but it does occasionally happen on
large, busy systems.
Clearly it is fundamentally an "nscd" bug. But that bug is
nevertheless
out there, in the wild, on such systems, potentially affecting dovecot's
delivery of valid user email.
We have had a source code hack since October (in "deliver.c", simply
replacing a "return ret" occurence with "return
EX_TEMPFAIL") and it has
worked nicely (ported forward from rc8 towards rc22). Mail re-queues and
a later delivery attempt then succeeds.
So it would be both helpful, and good for resilience against such real
OS/nscd bugs (and similar), if there were a configuration option in
dovecot to allow a site admin to tell deliver to use a temporary, 4xx,
failure instead (if the circumstances were appropriate for the site).
Could this be considered please, Timo?
--
: David Lee I.T. Service :
: Senior Systems Programmer Computer Centre :
: UNIX Team Leader Durham University :
: South Road :
: http://www.dur.ac.uk/t.d.lee/ Durham DH1 3LE :
: Phone: +44 191 334 2752 U.K. :
