Changes
/* Mail Domains */
* Mail Domain: A local mail domain. For example: example.com.
* Mail Domain Aliases: A mail domain (for example: example.org), which points to a local mail domain. For example: example.com. All email addresses ending with @example.org are thus forwarded to the local mail domain example.com.
* Mail Domain Forwards: A mail domain (for example: example.net), which points to an external mail domain. For (for example: external-domain.com).
* Third Level Mail Domains: A third level mail domain (for example: customers.example.com).
