[Dovecot] Proprietary mail storage.

[Alex Cherniak]

I have a large existing read-only collection of mails packaged in
individual zip files as <rfc822 file>+<some additional info>. Is it
possible (and how difficult) to create a proprietary plugin (like
gzip) which will open a zip file, extract mail and pass it back to
Dovecot? Where do I start? If plugin is not the right approach, what
is?
Another question is how will this affect Dovecot performance and how
to avoid any significant degradation.
Any help is appreciated.Thanks.