Creating a virtual domain

Click Virtual Domains in the Aliases, Domains and Routing section. This page lists all virtual domains defined on this mail server. To create a new virtual domain, click New Virtual Domain. A pop-up window will come up with the following options.

Virtual Domain

Enter the virtual domain here.

Postmaster

The postmaster is an email address of a real user that will act as a default (sometimes called catchall) email address. If an email is sent to a user that doesn't exist in the virtual domain, the postmaster of that domain will receive the mail. This is an optional field. If the postmaster is not defined, mail to unknown users will be rejected.

Now click Create Domain to create the virtual domain.

In the example, the virtual domain corp.guardiandigital.com will be created, with postmaster admin@guardiandigital.com.

You should have configured DNS so that all mail for corp.guardiandigital.com reaches this machine. This is done by adding a MX record for the domain corp.guardiandigit-
al.com in the DNS server, that points to this machine. If the MX record of corp.guard-iandigital.com points to another machine (say smtp.corp.guardiandigital.com), you must configure that machine (smtp.corp.guardiandigital.com) to forward all mail in the domain corp.guardiandigital.com to this machine using a mail route.