mail storage in a distributed database

Does anyone know of a mail store that uses a distributed database like Cassandra? I want something that has a delivery agent with a similar interface to maildrop or procmail and which has POP and IMAP servers to provide client access. IBM had a research project implementing a mail server on Cassandra but as far as I can tell they released nothing other than a PDF. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/