Cyrus 3.0.8 and purging/removing emails

Hi!

We do run a debian cyrus 3.0.8-6+deb10u3 mailserver, new setup, but we
did copy over some coonfigs from a older cyrus.

I recently discovered lots of emails in the local storage of the email
server, although the mailbox is empty.
In this case a IMAP shared folder, not a user INBOX.
IMAP tells the folder is empty, but in the folder on the disk still 800
files/mails available, partly 3 month old.

It seems I did miss the automatic removal of mails.

The cyrus.conf shows the line  delprune        cmd="/usr/sbin/cyrus
expire -E 3"

But it seems I did miss some important point.

On a cyrus restart it shows:

cyrus/cyr_expire[13235]: Expired 0 and expunged 0 out of 1449266
messages from 3993 mailboxes


Anyone has a idea what I did miss, or where to look?

thank you.

MfG,
Lars Schimmer
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