Multiple domains
Can I host more than one domain on your Zimbra service?
Yes – that’s one of the key benefits.
You can easily provision multiple domains and each domain can have mailboxes with different Classes of Service (CoS) so that you can select the most cost effective CoS for each mailbox.
Alias domains
One or more domains can be ‘aliased’ to a primary Zimbra domain so that any email addresses which exist on the primary are automatically valid on any of the alias domains.
Alias domains are free of charge.