So I followed the tutorial here to set up Postfix as a send only smtp server.

I'm currently using Gmail for business as my mail client for my domain. Any email sent from my droplet (my domain) to an email address on my domain doesn't get sent. I never get the emails in Gmail. I can get emails sent to other domains from my droplet though.

The only workaround I've found so far is to edit the /etc/postfix/main.cf file and change mydestination from "mydomain.com, localhost.mydomain.com, localhost" to just "localhost".

I'm just unsure if in doing that I'm opening up some sort of security hole. Is this the correct way to handle this? Is there another, better way?

Thanks