http://dovecot.org/pipermail/dovecot/2006-June/013818.html <-- timo's official answer to the 'can I store email in a sql database with dovecot' .. seems to suggest a shared filesystem is better than a non existent free multimaster database, maybe with postgres sporting multimaster as well as mysql these days (yes? pgpool at least .. or am I dreaming?) maybe this answer would be different today dunno