How to send mails from different Static/Dedicated IP in Postfix - CWP Linux Centos

This topic is about the mail sending from different dedicated/static IP in CWP Postfix and Linux server using postfix MTA. Suppose you've two or more dedicated static IP and you want to host websites in One Ip and use the second Ip to send Emails only for this you need to make changes to Postfix config like Below : 

Step 1 : 

Edit postfix master config  /etc/postfix/master.conf : 

nano /etc/postfix/master.conf

Step 2 : 

Find this lines and add this config : 

Quote

smtp      unix  -       -       n       -       -       smtp

and 

Quote

relay     unix  -       -       n       -       -       smtp

and below this two lines add this config : 

  -o smtp_bind_address=124.12.12.12

replace the ip with your second IP or the Ip you want to send email from

so the config will look like : 

smtp      unix  -       -       n       -       -       smtp
  -o smtp_bind_address=124.12.12.12 

relay     unix  -       -       n       -       -       smtp
  -o smtp_bind_address=124.12.12.12
  -o fallback_relay=

Step 3 : 

Restart postfix service : 

systemctl restart postfix