smtpd_tls_auth_only=yes smtpd_sasl_auth_enable=yes smtpd_sasl_security_options=noanonymous smtpd_sender_login_maps=hash:/etc/postfix/sender_login_maps smtpd_sender_restrictions=permit_sasl_authenticated,reject_sender_login_mismatch, permit smtpd_recipient_restrictions=permit_sasl_authenticated,reject_unauth_destination echo "${USER}@${DOMAIN} ${USER}" >> /etc/postfix/sender_login_maps postmap /etc/postfix/sender_login_maps