[Dovecot] transparent proxy

I'm excited to see that dovecot 1.0-test series supports transparent proxy, but that excitement is muted by:

• the recommendation to avoid 1.0 at present;
• the requirement to use SQL authentication.

I guess I could ignore the first, but the second is sticky. How hard would it be to hack a different sort of proxy server cue into the authentication? Perhaps one of:

If authenticating via passwd, use a gid as an index into a server table (or perhaps have the group name be a server name),

If passwd authentication fails, try a starting the proxy to a specific other server and see if one can log in there.

Or something else.. I dunno, I'm just looking not to install a SQL server just for this.

mm