Hello, Thank you for creating Dbmail, it really is a great IMAP server.
I have made some RPM's for Dbmail 1.2.9. If anyone is interested, they can be downloaded here: http://tankammo.com/rpms/dbmail/ . They were compiled on RHEL version 3, but should work on other platforms such as Fedora and more. I plan on keeping the rpm's reasonably up to date with stable Dbmail releases.
Regards, Will.