end users to change email passwords and...

[joximu]

on system level:
- postfix files as you said and you need a program which does the autoreply (you "can" use the one from ispcp - but maybe you may look for a better way?

nothing else is needed. If you want to use the ispcp functions to prepare the system files, then you need to modify the mail_users table:

update
mail_users
set
status = ?,
mail_auto_respond = ?
where
mail_id = ?

you need:
"change", autoresponder text (or '_no_') and the mail_id of the account.

and then send a connect to the request daemon...

/J

PS: see enable_mail_arsp.php: function gen_page_dynamic_data