[sork] [vacation] how choose and configure vacation driver

[Amendola Maurizio]

Hi 
I'm newbie to horde imp vacation environment.
I'm looking for to configure my module vacation(and forwards), but
I haven't found sufficient documentation.
I have 
vacation 2.2.1
Horde 3.0.5
Imp 4.0.3.
The mail services is so structured:
1 server webmail 	1 Qmail+ldap and the mailboxs are on nfs server.
Where can I found documentation? How works the drivers dot-forward,
qmail or sql?
Thank you
Regards
Maurizio