Step 1 :
Create and enable your free email account at Godaddy.com when you have a domain name there. Set the password accordingly. Your username of the account may be look like this : yourname@yourdomain.
Incoming Mail Server Type : POP3
Incoming Mail Server : pop.secureserver.net
Incoming Mail Server Port : 110
Outgoing Mail Server : smtpout.secureserver.net
Outgoing Mail Server Port : 25, 80, 587 or 3535
Step 2 :
Create a file namely "sasl_passwd".
sudo nano /etc/postfix/sasl/sasl_passwd
Add the following line.
Step 2a :
Save and quit. Issue the following commands.
chown root:root /etc/postfix/sasl/sasl_passwd
chmod 600 /etc/postfix/sasl/sasl_passwd
Step 3 :
Go to your mail server (Postfix).
sudo nano /etc/postfix/main.cf
Edit or/and add the following lines.
relayhost = [smtpout.secureserver.net]
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd
smtp_sasl_security_options = noanonymous
mynetworks = 192.168.0.0/24, 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
*If your network is 192.168.0.0/24, otherwise; change it accordingly.
Step 4 :
Restart the Postfix to make it work.
sudo /etc/init.d/postfix restart
Step 5 :
Now, you can send email with reverse lookup via Godaddy.com's relay mail server. Your email will not be blocked or redirected to "Junk Mail" folder by Gmail, Yahoo Mail or others.
Be keep in mind that you have 250 quota every day. Or, you are required to purchase more quota.
Point to your email server on other servers that will send email.
That's all. See you!