Okay I used dovecot sasl for smtp authentication with postfix based on flurdy's tutorial, I simply switch smtp/sasl auth to dovecot and used dovecot's sql userdb authentication and it worked.
Okay I used dovecot sasl for smtp authentication with postfix based on flurdy's tutorial, I simply switch smtp/sasl auth to dovecot and used dovecot's sql userdb authentication and it worked.