Send forwards to different end mailboxes

Does every alias in my SimpleLogin account need to go to the same email box.

For instance if my domain is , can I have

joe@blah .com go to joe@ hotmail. com
mary@blah. com go to mary@mary. com


It appears that any alias I create always gets delivered to my account email.

Any ideas? Am I missing something or is this an intentional limitation of the system?