Postfix Virtual mailbox for a user

(1) Create a system user and set password.
Here it is: linux

(2) Install postfix

#yum install postfix

(3) Made the following changes in the postfix configuration

mydestination = $myhostname, $mydomain, example.com
virtual_alias_maps = hash:/etc/postfix/virtual

(4) Specify the virtual mailbox in the file.

root@server]#tail -2 /etc/postfix/virtual

mail@example.com linux
                                                                    VIRTUAL(5)
[root@server]#