Mail server records can be defined to work for the default domain name or for a specific host.

When the mail server record is configured to use the default domain name, any incoming mail, which has not already been defined with its own mail server record, will be routed to these mail servers, in order of priority.

When the mail server record is configured to use another host's record, incoming mail for that specific host will first be delivered to the mail servers created here, in order of priority.

To save the mail server settings, make the desired changes, then click Apply.