[EXIM] Nasty exim bug?

Some idiot here did chown on my spool so that spool/log was not
writable by exim user. The problem is, it appears that this caused
the queue runner to requeue the messages - so that now I not only have
an enormous backlog of messages being delivered- but I'm getting 100
copies of each.

I'm not certain about what's happening - but is it possible that exim
caused these duplicates?

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