Configuring nodemailer mail notifications?

Question

Node.js

Hello! I have a feedback form on my site, I want that after submitting it, the form data will be sent to my mail provided by the hosting. It used to be set up for my mail via Gmail. And now, taking into account hosting, I don’t know how to register everything correctly

const dotenv = require("dotenv");
dotenv.config({ path: __dirname + "/.env" });

const express = require("express");
const bodyParser = require("body-parser");
const nodemailer = require("nodemailer");
const favicon = require("serve-favicon");
const app = express();

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(favicon(__dirname + "/favicon.ico"));

app.post("/contacts", (req, res) => {
  console.log(req.body);
  nodemailer.createTestAccount((err, account) => {
    const htmlEmail = `
        <h3>Contact details</h3>
        <ul>
        <li>Имя: ${req.body.name}</li>
        <li>Фамилия: ${req.body.lastName}</li> 
        <li>Email: ${req.body.email}</li>
        <li>Телефон: ${req.body.phone}</li>
        <li>Организация: ${req.body.organization}</li>
        </ul>
        <h3>Message</h3>
        <p>${req.body.message}</p>
        `;
    let transporter = nodemailer.createTransport({
      host: "",
      port: "",
      secure: true,
      requireTLS: true,
      auth: {
        user: process.env.REACT_APP_EMAIL,
        pass: process.env.REACT_APP_PASS
      }
    });

    transporter.verify(function(error, success) {
      if (error) {
        console.log(error);
      } else {
        console.log("Server is ready to take our messages");
      }
    });
    let mailOptions = {
      subject: "New message",
      text: req.body.message,
      html: htmlEmail
    };
    transporter.sendMail(mailOptions, (err, info) => {
      if (err) {
        return console.log(err);
      }

      console.log("Message sent: %s", info.message);
      console.log("Message URL: %s", nodemailer.getTestMessageUrl(info));
    });
  });
});

const PORT = process.env.PORT || 3001;

if (process.env.NODE_ENV === "production") {
  // Serve any static files
  app.use(express.static(path.join(__dirname, "/build")));

  // Handle React routing, return all requests to React app
  app.get("*", function(req, res) {
    res.sendFile(path.join(__dirname, "/build", "index.html"));
  });
}

app.listen(PORT, () => {
  console.log(`Server listening on port ${PORT}`);
});

Hosting is provided by RoundCube.
There is also information given by the hosting organization
To set up your mail client, use the following parameters:
POP3 Server: ***
POP3 Port: ***
IMAP Server: ***
IMAP Port: ***
SMTP Server: ***
Port SMTP: ***