/var/spool/qmailscan/tmp and /var/spool/qmailscan/working

Hi,
I have the problem that on my server it has happened before that
because of an unfortunate setup /var ran out of space and the
qmail processes stopped. Now I have the impression that when I made
space and restarted the qmail services, some of the files
in /var/spool/qmailscan/tmp and /var/spool/qmailscan/working seemed to
not be processed any more and stayed there forever. I assume that these
are just copies of email in the queue and I could safely delete them
but before I end up losing plenty of email, I wanted to make sure. Can
I safely purge these 2 directories without risking data loss? If not,
is there a simple way of recovering emails that are stuck in there?

Cheers,
Christian

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