Mail resources on a mail domain that has a mail domain alias will all have alternative addresses. Mail resources and their aliases will have different domain parts (i.e. mail domain and its alias) and the same resource names. For instance, with example.net being a mail alias to example.com, every mail resource on example.com will have a counterpart on example.net, specifically:
mailbox@example.net will be an alternative mail address to mailbox@example.com
mailforward@example.net will be an alternative mail address to mailforward@example.com
autoresponder@example.net will be an alternative mail address to autoresponder@example.com
etc.
To create a Mail Domain Alias:
Important: When removing mail domain alias, you remove aliases for ALL your mail resources on the primary mail domain. You cannot remove a mail domain alias for an individual mail resource.
To remove a mail domain alias: