How to send emails from the site?

Question

Nginx

The problem is that I can't send a letter from a site that is running a production version, but a letter is sent in the development version. I already created a topic before about this. But now, new circumstances.
Here are the logs, but I did not open any of them in terms of a solution, These are the nginx

logs server: alexandra.proto-dev.ru, request: "GET / HTTP/1.1", upstream: " localhost ", host: "alexandra.proto-dev.ru"
2019/09/02 13:11:49 [error] 20745#20745: *21071 upstream prematurely closed connection while reading response header from upstream, client: 77.222.105.17, server: alexandra.proto-dev.ru, request: "POST /send-email HTTP/1.1", upstream: "", host: "alexandra.proto-dev.ru", referrer: " alexandra.proto-dev.ru "
2019/09/02 13:15:02 [error] 20745#20745: *21085 upstream prematurely closed connection while reading response header from upstream, client: 77.222.105.17, server: alexandra.proto-dev.ru, request: "POST /send-email HTTP/1.1", upstream: " 127.0.0.1:3000/send-email ", host: "alexandra.proto-dev.ru", referrer: " alexandra.proto-dev.ru "
2019/09/02 13:26:14 [error] 20745#20745: *21128 upstream prematurely closed connection while reading response header from upstream , client: 77.222.105.17, server: alexandra.proto-dev.ru, request: "POST /send-email HTTP/1.1", upstream: " 127.0.0.1:3000/send-email ", host: "alexandra.proto-dev.ru", referrer: "alexandra.proto-dev.ru "
2019/09/02 13:53:18 [error] 20745#20745: *21153 upstream prematurely closed connection while reading response header from upstream, client: 77.222.105.17, server: alexandra.proto- dev.ru, request: "POST /send-email HTTP/1.1", upstream: " 127.0.0.1:3000/send-email ", host: "alexandra.proto-dev.ru", referrer: " alexandra.proto- dev.ru "
2019/09/02 13:53:35 [notice] 23002#23002: signal process started
2019/09/02 13:54:26 [error] 23003#23003: *21183 upstream prematurely closed connection while reading response header from upstream, client: 77.222.105.17, server: alexandra.proto-dev.ru, request: "POST /send-email HTTP/1.1", upstream: " 127.0.0.1:3000/send-email", host: "alexandra.proto-dev.ru", referrer: " alexandra.proto-dev.ru "
2019/09/02 14:00:45 [error] 23003#23003: *21208 upstream prematurely closed connection while reading response header from upstream, client: 77.222.105.17, server: alexandra.proto-dev.ru, request: "POST /send-email HTTP/1.1", upstream: " 127.0.0.1:3000/send-email ", host: "alexandra.proto-dev.ru", referrer: " alexandra.proto-dev.ru "
2019/09/02 14:04:01 [notice] 23361#23361: signal process started
2019/09/02 14:04: 32 [error] 23362#23362: *21228 upstream prematurely closed connection while reading response header from upstream, client: 77.222.105.17, server: alexandra.proto-dev.ru, request: "POST /send-email HTTP/1.1", upstream: "127.0.0.1:3000/send-email ", host: "alexandra.proto-dev.ru", referrer: " alexandra.proto-dev.ru "

Here is the container config

# Настройка сервера
server {
  listen 80;

  root /var/www/alexandra.proto-dev.ru;

  index index.html;

  server_name alexandra.proto-dev.ru;

  location ~* \.(?:ico|gif|jpe?g|png)$ {
    expires 7d;
    add_header Vary Accept-Encoding;
    access_log off;
  }

  location / {
        client_max_body_size 100m;
    proxy_send_timeout 180s;
        proxy_read_timeout 180s;
        proxy_pass http://localhost:3000;
  }

  location /nginx/ {
    root /var/www/;
    autoindex off;
  }

  location ~ /\. {
    deny all;
  }
}

Here is the server.js config

const fs = require('fs');
const next = require('next');
const express = require('express');
const multer  = require('multer');
const nodemailer = require("nodemailer");
const upload = multer({ dest: 'uploads/' });

const port = parseInt(process.env.PORT, 10) || 3000;
const dev = process.env.NODE_ENV !== 'production';
const app = next({ dev });
const handle = app.getRequestHandler();

app
    .prepare()
    .then(() => {
        const server = express();

        server.get('/', (req, res) => {
            const actualPage = '/index';
            app.render(req, res, actualPage);
        });

        server.post('/send-email', upload.single('file'), (req, res, next) => {
            const message = {
                to: `[email protected]`,
                subject: `Форма отправлена с сайта alexandra.proto-dev.ru`,
                text: `Клиент отправил контактную информацию

                Имя: ${req.body.name}
                Поятовый ящик: ${req.body.email}
                Сообщение: ${req.body.message}`,

                attachments: [
                    {
                        filename: `${req.file.originalname}`,
                        content: fs.createReadStream(req.file.path),
                    },
                ]
            };

            const transporter = nodemailer.createTransport(
                {
                    host: 'smtp.mail.ru',
                    port: 465 ,
                    secure: true,
                    auth: {
                        user: '[email protected]',
                        pass: 'xxx'
                    }
                },
                {
                    from: `Mailer test [email protected]`
                }
            );


            transporter.sendMail(message, (err, info) => {
                if (err) {
                    res.status(500).send('Email Send Error');
                }
                res.status(200).send('Email Send Successfully');
            });
        });

        server.get('*', (req, res) => {
            return handle(req, res)
        });

        const listenCallback = err => {
            if (err) throw err;
            console.log(`> Ready on http://localhost:${port}`)
        };

        dev ?
            server.listen(port, listenCallback) :
            server.listen(port, 'localhost', listenCallback);
    })

    .catch(ex => {
        console.error(ex.stack);
        process.exit(1);
    });

Answer 1

How about comparing versions?