title: Send email from static sites in docker containers linked by a reverse proxy on Digital Ocean
body: <p>I have a droplet on Digital Ocean. Here, I run several docker containers, each hosting a simple static website. I have them networked to the popular Nginx Reverse proxy container from Jwilder, which routes traffic to the container matching the domain requested.</p>
  
  <p>Now- I want to send mail (e.g. to submit forms) from my static sites, using basic sendmail in a php script.</p>
  
  <p>I am new to these topics, so I am not sure how to achieve this.</p>
  
  <p>I assume I have to somehow map the ports from the containers to the host machine and thus allow mail to pass through. But I have Googled tirelessly and cannot figure out how to achieve this. I have no code to show, but I have read so many things, my brain is spinning, and I am none the wiser.</p>