[Dovecot] Using sork-passwd from Horde to change dovecot password

I'm using in my server dovecot and Horde to provide IMAP and Webmail 

for virtual users. Their password are stored in a passwd file, since the setup is quite simple and small. I'd like to use the Horde module sork-passwd to allow changing of the passwords. Apparently, this can be done for the case of passwd file by using an expect script, or simply calling a program that receives the data.

It should not be hard to write a Perl (or Python, or whatever) 

script that does that. I'm just asking if someone has already done that and is willing to share the solution.