In /etc/postfix/main.cf hinzufügen
relayhost = smtp.server.com
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/smtp_auth
smtp_sasl_security_options = noanonymous
Datei /etc/postfix/smtp_auth hinzufügen:
smtp.server.com senduser:supersecret
Erstelle lookup-table /etc/postfix/smtp_auth.db :
postmap /etc/postfix/smtp_auth
Postfix reloaden:
sudo service postfix reload