The $w class contains all of the hostnames that the local system is known by. Incoming mail is then compared to the list of hosts found in the $w class. If a mail message is for a user on a host that is listed in the $w class, local delivery is attempted. Otherwise, external delivery over SMTP is assumed.

The $w class normally only includes "localhost", but can also include the host’s hostname alone, the domain name the host is in, the fully-qualified hostname (the hostname and the domain name together), and any other hostnames you may wish to use.

localhost

If you wish to configure Unoverica Message Transport to accept incoming mail that is addressed to user@domain.com, then you will need to add the domain name to the $w class. If the domain name is the same as the host’s local domain, you may wish to reference the $m macro instead of typing the domain name explicitly.

For instructions on configuring Unoverica Message Transport to process mail for an entire domain, refer to section 4.2 Routing Mail for a Domain.