Postfix email address change

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http://serverfault.com – Being new to Linux I have followed this tutorial to set up a mail server: https://www.digitalocean.com/community/articles/how-to-install-postfix-o... Everything is working correctly however I am sending mail from: [email protected] I want mail just being sent from [email protected], however when I change this section: myhostname = mail.example.com mydomain = example.com to myhostname = example.com mydomain = example.com Mail is not received. :( What is causing this ? Also, is there a way to change mail being sent fr (HowTos)