Hi,
You do not need to add A records to get this working.
(Assuming the External mail Servers are working). Here's an example on adding MX record from WHM -
domain name | TTL | Record Type | Priority | MX Record
example.com. | 14400 | MX | 10 | mx1.example.com.
example.com. | 14400 | MX | 20 | mx2.example.com.
Click “Save” at the bottom of the window.
Allow couple of hours for propagation and you're done!
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