Multiple email aliases for one user

I have a user with multiple email aliases receiving all its mails in the same box. Some of the emails do not specify which alias it belongs to ( the “to” is the same as the “sender” because he is probably using cci and the “delivered to” is the main email alias that none knows).
The user has these aliases : besides
When connecting to the mailbox via roundcube / thunderbird / pep, there is no way to know to which mailbox it belongs. (tried show headers)
I hope I’m clear.
Is there a way to fix it or should I just simply make a user for each alias?

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