<form [formGroup]="angForm" novalidate>
  <div class="message">
  <h3> Write to us </h3>
  </div>
  <div class="form__top">
  <div class="form__left">
  <div class="form__group">
  <input class="form__input form__input--name" type="text" formControlName="name" placeholder="name" #name>
  </div>
  <div *ngIf="angForm.controls['name'].invalid && (angForm.controls['name'].dirty || angForm.controls['name'].touched)" class="alert alert-danger">
  <div *ngIf="angForm.controls['name'].errors.required">
  Name is required.
  </div>
  </div>
  <div class="form__group">
  <input class="form__input form__input--email" type="email" formControlName="email" placeholder="email" #email>
  </div>
  <div *ngIf="angForm.controls['email'].invalid && (angForm.controls['message'].dirty || angForm.controls['message'].touched)"
  class="alert alert-danger">
  <div *ngIf="angForm.controls['message'].errors.required">
  message is required.
  </div>
  </div>
  </div>
  <div class="form__right">
  <div class="form__group">
  <textarea class="form__input form__input--textarea" placeholder="Message" formControlName="message" #message
  rows="3"></textarea>
  </div>
  <div *ngIf="angForm.controls['message'].invalid && (angForm.controls['message'].dirty || angForm.controls['message'].touched)"
  class="alert alert-danger">
  <div *ngIf="angForm.controls['message'].errors.required">
  message is required.
  </div>
  </div>
  </div>
  </div>
  <flash-messages></flash-messages>
  <div class="form__down">
  <div class="form__group">
  <button (click)="sendMail(name.value, email.value, message.value)" [disabled]="angForm.pristine || angForm.invalid" class="form__input form__input--submit" name="submit" type="submit" value="SEND MESSAGE">SEND MESSAGE
  </button>
  </div>
  </div>
 
  </form>

const express = require('express');
 const router = express.Router();
 const request = require('request');
 const nodemailer = require('nodemailer');
 
 router.get('/send', (req, res) => {
  const outputData = `
  <p>You have a new contact request</p>
  <h3>Contact Details</h3>
  <ul> 
  <li>Name: ${req.body.name}</li>
  <li>Email: ${req.body.email}</li>
  </ul>
  <h3>Message</h3>
  <p>${req.body.message}</p>
  `;
 
  let transporter = nodemailer.createTransport({
  service: 'gmail',
  secure: false,
  port: 25,
  auth: {
  user: 'MY EMAIL',
  pass: 'THE PASSWORD'
  },
  tls: {
  rejectUnauthorized: false
  }
  });
 
  let HelperOptions = {
  from: '"MYNAME" <MYEMAIL,
  to: 'MYEMAIL',
  subject: 'Majeni Contact Request',
  text: 'Hello',
  html: outputData
  };
 
 
 
  transporter.sendMail(HelperOptions, (error, info) => {
  if (error) {
  return console.log(error);
  }
  console.log("The message was sent!");
  console.log(info);
  });
 
 });
 module.exports = router;

// server.js
 const express = require('express');
 const bodyParser = require('body-parser');
 const cors = require('cors');
 const path = require('path');
 const app = express();
 // Port Number
 const port = process.env.PORT || 3000
 // Run the app by serving the static files
 // in the dist directory
 app.use(express.static(path.join(__dirname, '/majeni/dist/majeni')));
 // Body Parser Middleware
 app.use(bodyParser.json());
 
 //routes
 const contact = require('./app/routes/contact');
 app.use('/contact', contact);
 // CORS Middleware
 app.use(cors());
 // If an incoming request uses
 // a protocol other than HTTPS,
 // redirect that request to the
 // same url but with HTTPS
 const forceSSL = function () {
  return function (req, res, next) {
  if (req.headers['x-forwarded-proto'] !== 'https') {
  return res.redirect(
  ['https://', req.get('Host'), req.url].join('')
  );
  }
  next();
  }
 }
 
 // Instruct the app
 // to use the forceSSL
 // middleware
 app.use(forceSSL());
 
 // For all GET requests, send back index.html
 // so that PathLocationStrategy can be used
 app.get('/*', function (req, res) {
  res.sendFile(path.join(__dirname + '/majeni/dist/majeni/index.html'));
 });
 
 // Start Server
 app.listen(port, () => {
  console.log('Server started on port '+port);
  });

import { Injectable } from '@angular/core';
 import { Headers, Http, Response } from '@angular/http';
 import { Jsonp } from '@angular/http';
 @Injectable({
  providedIn: 'root'
 })
 export class ContactService {
 
  constructor(private http: Http) { }
 
  sendEmail(name, email, message) {
  const uri = 'http://localhost:3000/contact/send';
  const obj = {
  name: name,
  email: email,
  message: message,
  };
  return this.http.post(uri, obj);
  }
 }

Failed to load resource: net::ERR_CONNECTION_REFUSED : :3000/contact/send:1