--- postfix_relay_sasl_host: smtp.gmail.com postfix_relay_sasl_port: 587 postfix_relay_sasl_user: user postfix_relay_sasl_domain: gmail.com postfix_relay_sasl_passwd: secure # smtpd_banner contains $myhostname by default and # can't be removed postfix_relay_smtpd_banner: - ESMTP - $mail_name