[ingo] unable to activate filter script through ingo

[Shuvo]

Hi

i have configured ingo. my horde is running at one server (www) and my mail
is running at another server. i am able to telnet to that server using port
2000 but from horde/ingo i cant go to that server i am getting the following
errors

Jan 19 18:08:44 www httpd: PHP Fatal error:  Undefined class name
'auth_sasl' in /usr/share/pear/Net/Sieve.php on line 550

[root at www config]# telnet 192.168.70.141 2000
Trying 192.168.70.141...
Connected to 192.168.70.141 (192.168.70.141).
Escape character is '^]'.
"IMPLEMENTATION" "Cyrus timsieved v2.2.12-Invoca-RPM-2.2.12-15"
"SASL" "PLAIN LOGIN DIGEST-MD5 CRAM-MD5"
"SIEVE" "fileinto reject envelope vacation imapflags notify subaddress
relational comparator-i;ascii-numeric regex"
"STARTTLS"
OK


/* Sieve Example */
$backends['sieve'] = array(
    'driver' => 'timsieved',
    'preferred' => '192.168.70.141',
    'hordeauth' => true,
    'params' => array(
        // Hostname of the timsieved server
        'hostspec' => '192.168.70.141',
        // Login type of the server
        'logintype' => 'LOGIN',
        // Port number of the timsieved server
        'port' => 2000,
        // Name of the sieve script
        'scriptname' => 'ingo'
    ),
    'script' => 'sieve',
    'scriptparams' => array()
);

please help me


Mainul Islam Mithu