authenticate LDAP to email server

hi all,

i have installed dovecot+ postfix email server and a

LDAP server, if i create users on the LDAP server can dovecot pick up

the usernames and create a mailbox for the individual users

as atm

if i want to create an email address for users i add the user to the

email server and make a directory for the users mailbox and have to

chmod and chown

also just another question, can i set up mail groups on dovecot?