Create email.mailgun.org CNAME record
Our first entry is going to be to create a "CNAME" DNS entry for "email" - this will be used by Mailgun to track opens and log other info that can be seen in the "Tracking" section of your Mailgun Control Panel.
[/i]This entry is optional - you can skip it if you do not plan to use Jamroom's Newsletter module[/i]
So back in the DigitalOcean control panel, click on "DNS" in the left hand menu, then click on the small magnifying glass icon to the right of your domain you want to add the records to.
Once you are on the DNS records screen for your domain, click on the big blue "Add Record" button in the upper right and then click on "CNAME" for the type of record: