gomailer

A minimal example for sending emails with gmail in go

Instructions

Clone repo to $GOPATH/src/github.com/octohedron
Install dependencies

go get

Set env variables

export from_email=you@gmail.com
export email_password=hunter2
export to_email=yourotheremail@gmail.com

Build & run program

$ go build && ./gomailer &
Serving email server in port 5555

Test it with curl

$ curl -X POST \
 -F 'email=example@gmail.com' \
 -F 'name=example' \
 -F 'subject=ExampleSubject' \
 -F 'message=HelloWorld' \
  http://127.0.0.1:5555/sendemail
sent

Now you got the email server working, might need to add an nginx proxy, add your basic nginx configuration, then install and run certbot for SSL support

Install certbot with apt-get install python-certbot-nginx
Run certbot with certbot --nginx

Your new site.conf file should look like this

server {
    server_name email.example.com;
    location / {
            proxy_pass http://127.0.0.1:5555;
    }
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/email.example.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/email.example.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}
server {
    if ($host = email.example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

        listen 80;
        server_name email.example.com;
    return 404; # managed by Certbot
}

Reload nginx with service nginx restart

Now you can send emails through gmail, for example, with javascript

var formData = new FormData();
formData.append("name", "example name");
formData.append("email", "example email");
formData.append("subject", "example subject");
formData.append("message", "Hello World");
// make the request, change the server address
fetch("https://email.example.com/sendemail", {
  method: "POST",
  body: formData
}).then(result => {
  result.text().then(result => {
    if (result == 'sent') {
      alert("Email sent successfully :)")
    } else {
      alert("There was a problem :)")
    }
  });
});

octohedron/gomailer

gomailer

Instructions