How to change mail server ip address for qmail

1) first check the domain names which are configured on the server by viewing following file

cat /var/qmail/control/rcpthosts
domain1.com
domain2.com
domain3.com
domain4.com
domain5.com

2) By default the “/var/qmail/control/smtproutes” file  is not present on PLESK servers, so you need to create it.

vi /var/qmail/control/smtproutes

3) Then add the new ip addresses in the following format.

domain1.com:192.168.0.2
domain2.com:192.168.0.2

4) Then save the file and restart qmail

/etc/init.d/qmail restart

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