poppassd server

[olivier.herbelot]

i download poppassd and instal it, it works at the prompt like
    200 poppassd v1.8-ceti hello, who are you?
    USER o.herbelot
    200 Your password please.
    PASS 123456
    200 Your new password please.
    NEWPASS 456789
    200 Password changed, thank-you.
    quit
But i cant use it with imp
i tryed some parameters in /home/httpd/html/horde/imp/config/default.php3 like
    $default->change_password                = 'poppassd.php3';
    $default->poppassd_server                = 'poppassd' or '$SERVER_NAME' ou 'usr/sbin/poppassd'
    $default->poppassd_port                  = '0' or '106'
but nohting works

What can i do ?
thanks