Change Mail sending IP
Open the postfix configuration file, /etc/postfix/main.cf
Find if there is an entry as follows, in the postfix configuration file.
smtp_bind_address = xxx.xxx.xxx.xxx
If there isn't any entry of smtp_bind_address, you have to create it.
Change the value of smtp_bind_address = xxx.xxx.xxx.xxx to the desired IP.
Once you have made changes in the configuration file, you have to restart the postfix service.
[root@server ~]# /etc/init.d/postfix restart
You can check whether the new IP is loaded using the following command.
[root@server ~]# postconf smtp_bind_address
smtp_bind_address = yyy.yyy.yyy.yyy
