[Dovecot] Size limit for a single mail in the IMAP store?

Postfix has "message_size_limit = 26214400", but that doesn't keep my users from sending huge messages which canot be sent, but can be stored in the IMAP "Sent" folder.

Is it possible to set a size limit for the size of a single 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