[Mimedefang] Multiplexor trouble

[Steffen Kaiser]

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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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