To update the MX record Please follow the below steps:
1: Open the Plesk Panel, Click on the "DNS Settings" option.
2: Under that option click on "Add Record".
3: Once you click on it you will be redirect to the "Add a Resource Record to the Zone" section.
4: Under that section you need to select MX record in Record type and fillup the below details:
- Mail domain: It will be empty and contain your domain name only.
- Mail exchange server: In this you will add MX to which you want to point it.
- Priority: It will be 10.
5: Once you done click on OK.
NOTE: **MX records take maximum 24 hours to reflect**
