Postfix Cent0S Configuration for multiple email addresses

To make that clear we have two general e-mail accounts with the format "test$test.ml" & "test2$test.ml" . When a message comes to test$test.ml e-mail address , shall be accessible by test$internal.local & test2$internal.local (internal accounts) . When a message comes to test2$test.ml e-mail address shall be accessible only via test$internal.local.

Also, when test$internal.local send outside (external) email, should be masquerade as test$test.ml and leave a copy sent message at test2$internal.local.