Is it possible to create a mailbox or configure mail forwarding for a domain alias in Plesk?
The feature of creating mailboxes under domain aliases is yet to be implemented. Instead, the mailboxes of the primary domain are used.
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The current implementation shows that:
If the Mail service option is enabled during domain alias creation, the mailboxes created under the primary domain will also be available under the alias.
So the necessary forwarding rules can be configured on the mailboxes of the primary domain.