Alternative (raw) message store (i.e. instead of maildir)

[Ciprian Dorin Craciun]

    Hello all!

    My question -- rather a curiosity -- is if one could easily
implement an alternative message store instead of maildir. (I actually
have in mind a KV store like BerkeleyDB, or even a database like
CouchDB...) (I'm not also implying the same for the index, which I'm
aware is based on Xapian, which requires BerkeleyDB, which in turn
needs a local file system.)

    After quickly looking over the code (2 minutes actually) I saw
that currently this is not easily possible without touching a lot of
files... Or am I wrong?

    Better said: is such an abstract email store interface on the
to-do list, or even acceptable to have if someone provides it?

    Thanks,
    Ciprian.