Let us say my domain is xyz.com
Someone sends an email hello@xyz.com but this email id doesn’t exit
How can I route the senders email without giving a bounce back to a defined email box like queries@xyz.com
What you’re looking for is a catch-all email address. Follow this tutorial to add it,
https://www.virtualmin.com/documentation/tutorial/how-to-create-a-catch-all-email-account/
Add a catch all … see https://www.virtualmin.com/documentation/tutorial/how-to-create-a-catch-all-email-account/ then just redirect to the account you want it to go to