[Dovecot] Passwords in passwd-file

Hi!

I'm trying to use MD5 hashed password in a passwd-file (not the system one).

I've set auth_userdb = passwd-file /my/passwd/file auth_passdb = passwd-file /my/passwd/file

auth.txt additionally describes a syntax like:

auth_userdb = passwd-file[34] /my/passwd/file

to denote MD5 passwords in the file, but I've been unable to get any combination of using []'s after passwd-file to work. Dovecot complains: "Unknown userdb type".

How is it best to store passwords in a passwd-file using Dovecot 0.99.10.7? Ideally I want to use PHP to generate the passwords being entered into the file.

Thanks for any pointers!

Andrew