diff --git a/modoboa_installer/scripts/files/dovecot/conf.d/auth-sql.conf.ext b/modoboa_installer/scripts/files/dovecot/conf.d/auth-sql.conf.ext
index e0a3563..776b972 100644
--- a/modoboa_installer/scripts/files/dovecot/conf.d/auth-sql.conf.ext
+++ b/modoboa_installer/scripts/files/dovecot/conf.d/auth-sql.conf.ext
@@ -19,9 +19,9 @@ passdb {
 # "prefetch" user database means that the passdb already provided the
 # needed information and there's no need to do a separate userdb lookup.
 # <doc/wiki/UserDatabase.Prefetch.txt>
-#userdb {
-#  driver = prefetch
-#}
+userdb {
+  driver = prefetch
+}
 
 userdb {
   driver = sql
diff --git a/modoboa_installer/scripts/files/dovecot/dovecot-sql-mysql.conf.ext.tpl b/modoboa_installer/scripts/files/dovecot/dovecot-sql-mysql.conf.ext.tpl
index 8dc8446..4521006 100644
--- a/modoboa_installer/scripts/files/dovecot/dovecot-sql-mysql.conf.ext.tpl
+++ b/modoboa_installer/scripts/files/dovecot/dovecot-sql-mysql.conf.ext.tpl
@@ -133,7 +133,7 @@ user_query = SELECT '%{home_dir}/%%d/%%n' AS home, %mailboxes_owner_uid as uid,
 #  SELECT userid AS user, password, \
 #    home AS userdb_home, uid AS userdb_uid, gid AS userdb_gid \
 #  FROM users WHERE userid = '%%u'
-password_query = SELECT email AS user, password FROM core_user WHERE email='%%u' and is_active=1
+password_query = SELECT email AS user, password, '%{home_dir}/%%d/%%n' AS userdb_home, %mailboxes_owner_uid AS userdb_uid, %mailboxes_owner_gid AS userdb_gid, CONCAT('*:bytes=', mb.quota, 'M') AS userdb_quota_rule FROM core_user u INNER JOIN admin_mailbox mb ON u.id=mb.user_id INNER JOIN admin_domain dom ON mb.domain_id=dom.id WHERE u.email='%%u' AND u.is_active=1 AND dom.enabled=1
 
 # Query to get a list of all usernames.
 #iterate_query = SELECT username AS user FROM users
diff --git a/modoboa_installer/scripts/files/dovecot/dovecot-sql-postgres.conf.ext.tpl b/modoboa_installer/scripts/files/dovecot/dovecot-sql-postgres.conf.ext.tpl
index bc2aa66..6c11a18 100644
--- a/modoboa_installer/scripts/files/dovecot/dovecot-sql-postgres.conf.ext.tpl
+++ b/modoboa_installer/scripts/files/dovecot/dovecot-sql-postgres.conf.ext.tpl
@@ -133,7 +133,7 @@ user_query = SELECT '%{home_dir}/%%d/%%n' AS home, %mailboxes_owner_uid as uid,
 #  SELECT userid AS user, password, \
 #    home AS userdb_home, uid AS userdb_uid, gid AS userdb_gid \
 #  FROM users WHERE userid = '%%u'
-password_query = SELECT email AS user, password FROM core_user WHERE email='%%u' and is_active
+password_query = SELECT email AS user, password, '%{home_dir}/%%d/%%n' AS userdb_home, %mailboxes_owner_uid AS userdb_uid, %mailboxes_owner_gid AS userdb_gid, CONCAT('*:bytes=', mb.quota, 'M') AS userdb_quota_rule FROM core_user u INNER JOIN admin_mailbox mb ON u.id=mb.user_id INNER JOIN admin_domain dom ON mb.domain_id=dom.id WHERE email='%u' AND is_active AND dom.enabled
 
 # Query to get a list of all usernames.
 #iterate_query = SELECT username AS user FROM users