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On Tue, 19 Oct 2010, Steffen Kaiser wrote:
If the error would tempfail the message, well, it's low volume; but the
most problem is that the milter returns results of different queries to
the sendmail process:
sm-mta-ext[31396]: o9FB1Ls1031396: Milter: to=<[existant-internal-user]>,
reject=550 5.1.1 <[non-existant-one]>: SMTP VRFY: 550 5.1.1
<[non-existant-one]>... User unknown
sorry, that I did not reported back, I was triggered by a request for a
follow up, so here it is:
My problem went forth some months. The number of erroreous replies did not
increase, but were not be seen for a week once in a while. However, the
log entry indicates that an existing user was rejected, pretending to be a
non-existing user. The other way round, that a non-existing user was
accepted because an existing user was looked up instead, was never
logged, hence, this number is unknown.
I restarted all services and even the whole machine at least once, nothing
helped. I checked the data of the queried users and also made some general
tests, e.g. I dumped the whole user DB and made a "check some records by
glancing at them". I sent duplicates of the messages, even interleaved
sendings dups of a series of three or four messages.
At one point the local copy of OpenLDAP running as a cache and
automatically replicated by the central OpenLDAP via the syncprov overlay
went awry _detectably_, I mean ldapsearch returned clearly incorrect
results often and finally the slapd process died, when I poked it hard.
So I removed the local copy of the OpenLDAP database, restarted the
demon and about 15 minutes later the mail server was stable again.
I do not know why sendmail got the result of a previous query of
MIMEDefang, I also dunno why rebuilding the user DB helped.
- -> I'm not sure that rebuilding the user DB fixed the cause of my problem
or if really a hardware failure is the source. But the server is working
several months now without errors.
Regards,
- --
Steffen Kaiser
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