About Email setup and sending email

[Castey]

In main.cf set mynetworks and mydestination to (it's mainly mydestination error):

Code:

mynetworks = 127.0.0.0/8 mydestination = localhost.$mydomain, localhost

or

Code:

mynetworks = 127.0.0.0/8 mydestination = localhost.$mydomain, localhost, mail.yourdomain.com

and restart postfix, it's work for me.