Windows hosting servers are best to host website and it supports different Microsoft technologies and due to different activities on hosting resources in server if primary mail server IP address is blocked in any spam checker sites ( eg BARRACUDA, SORBS-SPAM etc) then there is only one solution, that is changing the mail server IP address on the server.
You can easily change the mail server IP address in cPanel by using /etc/mailips file. The same as in PLESK you can also change the outgoing mail server IP address by using “/var/qmail/control/smtproutes”file.
Steps to change the mail server ip address in PLESK :
Step 1: First, check the domain name which is hosted on the Windows hosting server by using the following file
cat/var/qmail/control/rcpthosts domain1.com domain2.com domain3.com domain4.com domain5.com
Step 2: By default the “/var/qmail/control/smtproutes” file is not present on PLESK server, you need to create it.
Step 3: Then add the new ip address in the following format.
Step 4: Save the file and restart qmail
[alert] Note: Please replace the “192.168.x.2” to original IP address and the “yourdomain.com” equal the original domain name. [/alert]