What to put on MX record when using Ubuntu Posfix SMTP?

I configured SMTP postfix from Ubuntu 14. I already reroute my domain from another site to use digitalocean namespace. I also configured my digital ocean control panel and added my domain name, A, Cname but I do not know what to put on MX record?

Do I need to put something on MX record when I want to use SMTP postfix from Ubuntu 14?

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In the MX record you need to put the IP address of the server where postfix is installed.

If you have then your MX record should point to and the IP address of your server.

Hope this helps.