driver = pgsql
connect = host=dbserver dbname=postfix user=postgres password=psqlpass
default_pass_scheme = MD5-CRYPT

user_query = \
    SELECT \
        '/var/mail/domains/%u/' as home, \
        'maildir:/var/mail/domains/%u/' as mail, \
        8 as uid, \
        12 as gid\
    FROM mailbox \
    WHERE username = '%u' AND active = true

password_query = SELECT \
    username AS user, \
    password, \
    8 as userdb_uid, \
    12 as userdb_gid, \
    '/var/mail/domains/' || maildir AS userdb_home, \
    '/var/mail/domains/' || maildir AS userdb_mail \
    FROM mailbox \
    WHERE username = '%u' AND active = true