How to create or edit the MX windows in plesk windows server
Login to your Plesk using the username and password associated with your domain. In right pane below the services tab, you can find the option as DNS settings.
Navigate in dns settings and click Add record MX records. Delete any existing MX records before entering new MX records.
The DNS entries will be listed where it can used to edit those records you can easily check if your MX record changed