Random messages stuck in mqueue

Corey McFadden cmcfadden01 at gmail.com
Wed Aug 1 18:28:08 IST 2007

It does seem as though the problem begins when MailScanner disposes of a
message.  Maybe someone could clarify the process whereby Sendmail picks up
the message and decides to deliver it (locally or relay or whatever.)

It doesn't look like a DNS issue.  We've got a local resolver (that has a
PTR record for the machine's IP) and a backup resolver.  I've done a number
of DNS tests and haven't been able to produce an error there.

On other systems everything happens so quickly that it's hard to see what
happens but does it resemble this:
 - MailScanner finds message in mqueue.in
 - MailScanner processes message and dumps qf/df into mqueue
 - Sendmail daemon periodically scans mqueue

 - MailScanner finds message in mqueue.in
 - MailScanner processes message and spawns a sendmail process for delivery

What are the implications of the "Delivery Method" queue vs. batch option on
the above?

Thanks for the input!


On 8/1/07, Scott Silva <ssilva at sgvwater.com> wrote:
> Corey McFadden spake the following on 7/31/2007 9:46 PM:
> >
> > Guys,
> >
> > We're experiencing an issue on one of our boxes where messages (a good
> > percentage) are hung in /var/spool/mqueue after being processed by
> > MailScanner.  Even those to be delivered locally will sit for
> > (sometimes) hours until they're finally delivered.
> >
> > I've never seen this behavior before and something is definitely awry.
> >
> > Here's the environment:
> >
> > This is CentOS release 4.5 (Final)
> > This is Perl version 5.008008 (5.8.8)
> >
> > This is MailScanner version 4.61.7
> >
> > Executing 'sendmail -q -v' WILL process the stuck messages but can take
> > quite a long time to run because it will try to deliver everything
> > queued in a linear fashion.
> >
> Since it is in mqueue and not mqueue.in, mailscanner is pretty much out of
> the
> loop. Check if you have a FQDN that resolves properly as this will choke
> sendmail quickly. Also try a local caching nameserver, as sendmail might
> be
> taking a long time to resolve delivery addresses.
> --
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> you notice quickly if they don't!!!!
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