Issues with mail forwarding


I’m facing an issue with email forwarding. My server has virtualmin/postfix.
To elaborate the issue. lets say that my domain is .

I’ve setup an email forward from to .
So when I send an email from my personal mail to , I get a bouceback message even-though the mail receives at the mailbox of .
But, the mail never receives at . The bounce back message I get is as follows:

This is the mail system at host

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system (expanded from unknown user: “user2”

Final-Recipient: rfc822;
Original-Recipient: rfc822;
Action: failed
Status: 5.1.1
Diagnostic-Code: X-Postfix; unknown user: “user2”

So please help me out with this as I have tried a lot of solutions on myown.
Any help is appreciated.

Are you able to send mail directly to user2?