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Hello,
If you are currently going to use your droplet for running a mail server for sending and receiving mail, you will need to configure your MTA to listen publically on port 25 and your MX records will point to your droplet’s hostname.
If you would like to only use your droplet for sending mail, you may want to check out the following tutorial: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-14-04
Please let us know if there is anything else we can help you with.
Best, Mike DigitalOcean Support Check out our community for great tutorials, articles and FAQs! https://digitalocean.com/community