Redirect Exchange 2016 emails

Dear Experts, I got a question here:

It had an solution but we got new requirement:
I tested with and, these are the results:
1. When users sent from mailboxes, recipients see those coming from  ----------------------------------------> OK

2. When recipients sent emails to or, those emails went to and, respectively

How can we configure so that, in step 2, all emails will be forwarded to  

Could you please help?
DP230Network AdministratorAsked:
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IvanSystem EngineerCommented:

Have you created email policy and assigned domain to all users? All users now have both and email address or not?

DP230Network AdministratorAuthor Commented:
Hi Ivan, yes I created an email address policy and applied it, all users now have both and email addresses

Could you please suggest?
IvanSystem EngineerCommented:

but i dont understand what is actually wrong.

If user Ivan has an email address of and, why would you want to redirect something to
That is the same user...

When someone from internet send to either or, it will end up in the same mailbox.

I must be missing you point..
DP230Network AdministratorAuthor Commented:
How? I configure them as 2 separate systems. How do you think ?
what is your default Domain in Email Policy? both domains are in Email Policy right? it is irrespective of how you configure them, if all your domains are in email policy, it will fall in the same mailbox.

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