Login to your account at clients.domgys.in
1.Go to Domains
2.Choose the Domain( For which you want to add MX)
3.Go to DNS Management at Left panel
4.Select MX from scroll arrow sign > Leave the "Sub domain" section blank > Add the value in other box
5. Set priority as 0 or 1 ( Of as it is given by your email provider)
6. Click Submit
There would be DNS propagation time which can be up to 24-48 hours.