[Dovecot] Recipe for "admin-less restore"

Is there a way for setting up dovecot in such a way that a user can "jump back in time" to an old mailbox "state" in order to retrieve his accidentially deleted mail?

-- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt@charite.de | http://www.charite.de