How to activate postfix Quota?

[waweiwi]

you meant, these lines

# Quota support; activate, if available/used
virtual_create_maildirsize = yes
virtual_mailbox_extended = yes
virtual_mailbox_limit_maps = mysql:/etc/postfix/mysql_virtual_mailbox_limit_maps.cf
virtual_mailbox_limit_override = yes
virtual_maildir_limit_message = "The user you're trying to reach is over mailbox quota."
virtual_overquota_bounce = yes

in addition to:
user = root
password = password
dbname = ispcp
table = users
select_field = quota
where_field = email
hosts = 127.0.0.1

also to recompile postfix with VDA.

Is ispcp database support postfix quota by default?

How I can increase the default 10M quota per user, when I create a new email user?