Hello, You can add MX Record in DirectAdmin Hosting Control Panel very easily.
In this tutorial we will see how to do this.
At First Login to Your DireactAdmin Control Panel then go to DNS Management .
You will see below panel to add DNS Records.
Now click Add Record
You can add ALL Type of DNS Records Here. A Record, MX Record, TXT Record, CNAME Record etc
Choose MX Record in Record Type, Then fill your details and click ADD.
After addition you can check all your DNS Records with your newly added records on DNS Management option.