undelete a single message, delete_mode + expunge_mode activated

[Marcus Schopen]

Hi,

I've just activated 

 delete_mode: delayed
 expunge_mode: delayed

on my cyrus 2.4.12.

A deleted subfolder "testfolder3" from testuser's Inbox is moved to

 /var/spool/cyrus/mail/u/DELETED/user/testuser/testfolder3/531E16DC/

I can undelete the complete folder using rename[1]

localhost> rename DELETED.user.testuser.testfolder3.531E16DC
user.testuser.testfolder3_recovery

This seems to work fine with folders. 

When deleting a single message from Inbox or a subfolder these message
are not moved into a DELETED structure and keep staying at their
originally place on filesystem. Those messages are definitely delete. I
can't see them in my imap client anymore (tested with evolution and
Thunderbird). How do I undelete these single messages?

Ciao
Marcus

[1]
http://www.cyrusimap.org/~vanmeeuwen/cyrus-imapd-2.4-docs/Administrator_Guide/html/chap-Administrator_Guide-Deleting_and_Undeleting_Messages_and_Folders.html