Passwd didn't working

Hi,
I've configured an Horde+IMP+Sork but the passwd didn't working. The
error that I receive when click on Change Password was
"Failure in changing password on Vpopmail Server: Wrong Password"
No php error there. 
The log of mysql server:

36 Connect     vpopmail@localhost on vpopmail
36 Query       select pw_name, pw_passwd, pw_uid, pw_gid, pw_gecos,
pw_dir, pw_shell from vpopmail where pw_name = "andur" and pw_domain =
"fpsroma.cisl.it"

My backend.php:

$backends['vpopmail'] = array (
    'name' => 'Vpopmail Server',
    'preferred' => '',
    'password policy' => array(
        'minLength' => 3,
        'maxLength' => 10,
        'maxSpace' => 0,
        'minUpper' => 1,
        'minLower' => 0,
        'minNumeric' => 1
    ),
    'driver' => 'vpopmail',
    'params' => array(
        'phptype'    => 'mysql',
        'hostspec'   => 'localhost',
        'username'   => 'vpopmail',
        'password'   => '[__NOTSHOW__]',
        'encryption' => 'crypt',
        'database'   => 'vpopmail',
        'table'      => 'vpopmail',
        'name'    => 'pw_name',
        'domain'  => 'pw_domain',
        'passwd' =>  'pw_passwd',
        //'clear_passwd' => 'pw_clear_passwd',
        'use_clear_passwd' => false,
        'show_encryption' => true
    )
);



And my vpopmail was 5.4.16 compiled with:
./configure --prefix=/usr --host=i686-pc-linux-gnu
--mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share
--sysconfdir=/etc --localstatedir=/var/lib --enable-ip-alias-domains=y
--enable-auth-module=mysql --enable-libs=/usr/include/mysql
--enable-libdir=/usr/lib/mysql --enable-sql-logging=y
--enable-auth-logging=y --enable-valias=y --enable-mysql-replication=n
--enable-mysql-limits --enable-clear-passwd=n --sbindir=/usr/sbin
--bindir=/usr/bin --sysconfdir=/var/vpopmail/etc
--enable-qmaildir=/var/qmail
--enable-qmail-newu=/var/qmail/bin/qmail-newu
--enable-qmail-inject=/var/qmail/bin/qmail-inject
--enable-qmail-newmrh=/var/qmail/bin/qmail-newmrh
--enable-vpopuser=vpopmail --enable-many-domains=y
--enable-vpopgroup=vpopmail --enable-file-locking=y --enable-file-sync=y
--enable-md5-passwords=y --enable-logging=y --enable-log-name=vpopmail
--enable-qmail-ext --disable-tcp-rules-prog --disable-tcpserver-file
--disable-roaming-users --build=i686-pc-linux-gnu

I've tryed to check the php function to use crypt("actual pass"); but
everytime that i do that the result was different!!! o_O
How passwd will check the password if ther hash was different as the
original but the password was the same??

Pls help me.
Andrea Durante
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