Ok thanks... i'll wait...
Hi,
i've used the default password plugin of roundcube and for me this solution it works
1) Rename the /var/www/imscp/gui/public/tools/webmail/plugins/password/config.inc.php.dist in config.inc.php
2) Edit the config.inc.php
### Use a user and password that can read and write the imscp database in mail_users table, e.g. the dovecot_user ###
$rcmail_config['password_db_dsn'] = 'mysql://user:password@localhost/imscp';
### Replace the standard sql password query with this line ###
$rcmail_config['password_query'] = 'UPDATE mail_users SET mail_pass=%p WHERE mail_addr=%u AND mail_pass=%o LIMIT 1';
3) edit the /var/www/imscp/gui/public/tools/webmail/config/main.inc.php
### Replace imscp_pw_changer with password in the array plugin ###
$rcmail_config['plugins'] = array('contextmenu', 'password', 'zipdownload', 'pdfviewer', 'newmail_notifier', 'managesieve', 'emoticons', 'dkims$
Et voilà
Remember to make a backup of /var/www/imscp/gui/public/tools/webmail/config/main.inc.php and /var/www/imscp/gui/public/tools/webmail/plugins/password/config.inc.php file before to make a upgrade to a new version of i-MSCP
Hope this can be helpful to you
Sorry for my bad english
Bye bye