Map Postfix User
Create a Testing User#adduser tox
#passwd tox
Note :
We will map user "tox" to domain postfixrocks.org
so user tox will have an email like tox@postfixrocks.org
Map User to Postfix
#vi /etc/postfix/virtual
postfixrocks.org virtual
tox@postfixrocks.org tox
Postmap Postfix Virtual
#postmap /etc/postfix/virtual
Reload Postfix
#postfix reload