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.
Now- I want to send mail (e.g. to submit forms) from my static sites, using basic sendmail in a php script.
I am new to these topics, so I am not sure how to achieve this.
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.