These forums are locked and archived, but all topics have been migrated to the new forum. You can search for this topic on the new forum: Search for Alias Domain, how can I create a Mailbox for a Alias Domain not a Subserver, no Forwarding on the new forum.
Actually - you can't. :)
An Alias domain is what the name says: An alias, as in an "exact copy", of another domain. Therefore, all email addresses of the "real" domain are copied - if set up accordingly - to the Alias. You cannot set up individual mailboxes in an Alias.
The behavior for email addresses, either "Copy aliases from target" or "Catchall forwarding", can be configured in the server template, section Mail for domain.
Why do you need to use an alias domain instead of a sub-server or main server?
I use a Typo3 with different Domains and Projects in the same System