A storage plugin for Dovecot, which enables the storage of emails in Ceph RADOS
objects. The focus is currently on a hybrid model where the emails are stored
in RADOS objects, while all other metadata (lists, index, cache) are stored in
a file system that is located locally on the Dovecot server or on shared CephFS
volumes. The latter allows the operation of Dovecot completely on Ceph.

As a bonus, a dictionary plugin is included, which allows the storage of
Dovecot dictionaries in Ceph OMAPs.