Basic Postfix Configuration

Name of Relay Host
Enter the name of the mail server to which all non-local mail should be relayed. Important: If you activate dial-on-demand, you must enter a valid host name here. As Postfix cannot resolve host names, it is automatically added to /etc/hosts.
Dial-on-Demand
Activate or deactivate dial-on-demand.
Authentication via smtp-auth for Incoming SMTP Connections (SASL)
If you activate this function, users will be able to authenticate to your server using mail programs. This is necessary, for example, if users must use your server as a mail relay and are not within your own network.
SPAM Filter
The SPAM filter checks all mail for criteria that indicate a SPAM mail.
Caution: Checking for SPAM consumes a lot of CPU and RAM capacity. If your server receives a lot of mail or large messages, it might be overloaded quickly. Make sure your server has enough memory.
Encrypted Connection via TLS (certificate required)
Activate or deactivate TLS (Transport Layer Security), used to encrypt mail during the transport.

Additionally, you could use client certificates to authenticate, similar to SMTP AUTH, for using your server as a mail relay. Important: This parameter will be active as soon as you set up a CA.

Virus Scanner
This option only appears if the package amavisd-postfix is installed and amavisd is running (/etc/init.d/amavis start).