How to change mail server ip address in PLESK
1) First check the domain name which is hosted on the Windows hosting server by using following file
2) By default the “/var/qmail/control/smtproutes” file is not present on PLESK server, you need to create it.
3) Then add the new ip address in the following format.
4) Save the file and restart qmail
Note: Please replace the “192.168.xx.1” to original ip address and the “yourdomain.com” equal the original domain name.