Hello

I install sendmail and then Postfix. At that time, I'm okay to send gmail, hotmail but not to other domain name. Then I uninstall sendmail by using https://gist.github.com/adamstac/7441659

Now I'm in trouble. No error but it doesn't send email. I found this post http://www.superjer.com/forum/send_and_email.php and I tried it.

I can send the email from terminal

The problem is when I type
sudo postfix start
postfix/postfix-script: starting the Postfix mail system
postfix/postfix-script: fatal: mail system startup failed

Please let me know how to figure it out.
Thanks in advance