Issues with mail forwarding

Hi,

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

I've setup an email forward from user1@test.com to user2@test.com . So when I send an email from my personal mail to user1@test.com , I get a bouceback message even-though the mail receives at the mailbox of user1@test.com . But, the mail never receives at user2@test.com . The bounce back message I get is as follows:

++++++++++++++++++++ This is the mail system at host test.com.

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

user2@test.com (expanded from user1@test.com): unknown user: "user2"

Final-Recipient: rfc822; user2@test.com Original-Recipient: rfc822;user1@test.com 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.