If you use an external mail agency (such as fusemail or fastmail), then leave out the A-record creation and point the MX record as directed by your provider.
So, log into the Slice Manager at https://manage.and navigate to the DNS tab: Now click on the 'records' link next to your domain.
In addition I have another server running the same OS and Postfix/Dovecot.
My issue is with naming my email server and pointing the Go Daddy MX record to it.
If you haven't created a zone for your domain, then refer to this article.
You should already have the base records shown here: Click on the 'new record' link.
Keep in mind this signing gets lost when emails are forwarded.I'm dropping my hosting and email service with Go Daddy. I have setup an Ubuntu Linux 14.04.3 Apache2 web server and it is working.I just need to open the port and point my domain to my IP address.Of course, mail services for custom domains typically come with a fee, but Zoho offers a free mail service for up to 10 users on a single custom domain.This tutorial will show you how to set up Zoho Mail with your custom domain that is managed by Digital Ocean's Domain Name Servers.