Im experience a bit problem having the server send mails through the relay host. warning: SASL authentication failure: All-whitespace username. my relayhost doesnt need username/password. And i have those fields empty in ispconfig server setup for mail. But it adds this in the sasl_password file: smtp.myisp.net : I have solved this temporary by disabling the sasl_password map file in postfix conf. But is there a better way? to get ispconfig to not try to authenticate my relay with blank username/password on some way?