如何使用Angular和Node服务器发送电子邮件？

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-mail',
  templateUrl: './mail.component.html',
  styleUrls: ['./mail.component.css']
})
export class MailComponent {
  recipient: string;
  subject: string;
  content: string;

  constructor(private http: HttpClient) { }

  sendMail() {
    const mailData = {
      recipient: this.recipient,
      subject: this.subject,
      content: this.content
    };

    this.http.post('/send-mail', mailData).subscribe(
      (response) => {
        console.log(response);
        // 显示发送成功的消息
      },
      (error) => {
        console.error(error);
        // 显示发送失败的消息
      }
    );
  }
}

const express = require('express');
const router = express.Router();
const nodemailer = require('nodemailer');

router.post('/send-mail', (req, res) => {
  const { recipient, subject, content } = req.body;

  const transporter = nodemailer.createTransport({
    host: 'smtp.example.com',
    port: 587,
    secure: false,
    auth: {
      user: 'your-email@example.com',
      pass: 'your-password'
    }
  });

  const mailOptions = {
    from: 'your-email@example.com',
    to: recipient,
    subject: subject,
    text: content
  };

  transporter.sendMail(mailOptions, (error, info) => {
    if (error) {
      console.error(error);
      res.status(500).send('邮件发送失败');
    } else {
      console.log('邮件发送成功:', info.response);
      res.send('邮件发送成功');
    }
  });
});

module.exports = router;