[horde] Problem with _horde_hook_preauthenticate

[Giorgio Volpe]

Some times ago I posted the following message ... but received no answer!
does anybody can help me?
Is it a stupid question?

by

Giorgio

> I'm tring to use _horde_hook_preauthenticate as suggested in
http://wiki.horde.org/ImapSelect to map horde username to real usernames
...
> In no way I can see the function called when i try to log in!
>
> I've activated the hook in horde3/config.php writing
$conf['hooks']['preauthenticate'] = true;
>
> I'm using imp as the authentication backend. Is
_horde_hook_preauthenticate called only by horde authentication and not
by imp?
>
> Any int?
>
> thanks  Giorgio