I have just upgraded my dbmail to dbmail 2.2.6-rc1.
Announcement : http://www.gossamer-threads.com/lists/dbmail/users/22531
Changelog : http://nfg3.nfgs.net/cgi-bin/gitweb.cgi?p=dbmail.git;a=log;h=dbmail_2_2
Download : http://www.dbmail.org/download/2.2/dbmail-2.2.6-rc1.tar.gz
How to upgrade from previous release (2.2.5)
1. Stop postfix, dbmail-imapd, dbmail-lmtpd and dbmail-timsieved using service command.
2. Download the tarball and extract it.
3. Enter the installation folder and run :
./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var --with-mysql --with-sieve
5. make install
6. Restart all the stopped services.
That's all there is to it.