nginx configuration tweak

I set up a digitalocean vps: Ubuntu 16 / nginx / php7 / wordpress. (no Varnish). I used these directions: [login to view URL] Everything is okay except wordpress throws an error when trying to make outbound http requests when it connects to the theme developer's site to validate the theme license. Job: tweak the configuration to fix the above problem. Future job, if we work well together: Set up mail so that wordpress can send me mail when a form is submitted, etc. Or set up an actual mail server so that I can send/receive emails, use webmail, etc. Future job, if we work well together: I'm thinking of moving some existing sites on shared hosting to such a server, the future job is to duplicate that server configuration so I can (or you can) migrate the site. Plus routine server maintenance.