Nodemailer - 服务器上缺少“普通”的凭据

问：

我在 DigitalOean 的应用程序平台上有一个 mern 应用程序。如果用户注册，他们会收到一封欢迎电子邮件，要求他们验证其电子邮件地址。如果他们不这样做，当他们登录时，他们会在个人资料页面上看到一个按钮，用于重新发送验证电子邮件。

我正在使用 nodemailer 发送电子邮件，目前通过我的个人帐户（稍后会更改）。它适用于本地主机和 Render.com 但在数字海洋上，我收到以下错误：

 Error: Missing credentials for "PLAIN"
[mat-scout] [2023-11-08 02:05:49]     at SMTPConnection._formatError (/workspace/node_modules/nodemailer/lib/smtp-connection/index.js:790:19)
[mat-scout] [2023-11-08 02:05:49]     at SMTPConnection.login (/workspace/node_modules/nodemailer/lib/smtp-connection/index.js:444:38)
[mat-scout] [2023-11-08 02:05:49]     at /workspace/node_modules/nodemailer/lib/smtp-transport/index.js:272:32
[mat-scout] [2023-11-08 02:05:49]     at SMTPConnection.<anonymous> (/workspace/node_modules/nodemailer/lib/smtp-connection/index.js:213:17)
[mat-scout] [2023-11-08 02:05:49]     at Object.onceWrapper (node:events:627:28)
[mat-scout] [2023-11-08 02:05:49]     at SMTPConnection.emit (node:events:513:28)
[mat-scout] [2023-11-08 02:05:49]     at SMTPConnection._actionEHLO (/workspace/node_modules/nodemailer/lib/smtp-connection/index.js:1347:14)
[mat-scout] [2023-11-08 02:05:49]     at SMTPConnection._processResponse (/workspace/node_modules/nodemailer/lib/smtp-connection/index.js:969:20)
[mat-scout] [2023-11-08 02:05:49]     at SMTPConnection._onData (/workspace/node_modules/nodemailer/lib/smtp-connection/index.js:755:14)
[mat-scout] [2023-11-08 02:05:49]     at TLSSocket.SMTPConnection._onSocketData (/workspace/node_modules/nodemailer/lib/smtp-connection/index.js:193:44) {
[mat-scout] [2023-11-08 02:05:49]   code: 'EAUTH',
[mat-scout] [2023-11-08 02:05:49]   command: 'API'
[mat-scout] [2023-11-08 02:05:49] }

我现在尝试添加文本：“Hello World”，但我仍然收到错误。下面是 mail.js 文件：

import nodemailer from "nodemailer";
import path from "path";
import { fileURLToPath } from "url";
import { generateTemplate } from "../mail/template.js";

const generateMailTransporter = () => {
  let transport = nodemailer.createTransport({
    host: "smtp.comcast.net",
    port: 587,
    secure: false,
    auth: {
      user: process.env.EMAIL,
      pass: process.env.EMAIL_PASS,
    },
  });

  return transport;
};

export const sendVerificationEmail = async (token, link, profile) => {
  const __filename = fileURLToPath(import.meta.url);

  const __dirname = path.dirname(__filename);

  const transport = generateMailTransporter();

  const { firstName, email } = profile;

  const welcomeMessage = `Hi ${firstName}, welcome to !  There are so many features available to verified users. Use the given OTP (One-Time-Password) to verify your email.`;

  transport.sendMail({
    to: email,
    from: process.env.VERIFICATION_EMAIL,
    subject: "Welcome to MatScout",
    text: "hello world",
    html: generateTemplate({
      title: "Welcome to MatScout",
      message: welcomeMessage,
      logo: "cid:logo",
      banner: "cid:welcome",
      link,
      btnTitle: "Verify Your Email",
    }),
    attachments: [
      {
        fileName: "logo.png",
        path: path.join(__dirname, "../mail/logo.png"),
        cid: "logo",
      },
      {
        fileName: "welcome.png",
        path: path.join(__dirname, "../mail/welcome.png"),
        cid: "welcome",
      },
    ],
  });
};

export const sendForgotPasswordLink = async (link, profile) => {
  const __filename = fileURLToPath(import.meta.url);
  const __dirname = path.dirname(__filename);

  const transport = generateMailTransporter();
  const { email } = profile;
  const message = `We just received a request to reset your password.  Use the link beloow to create a new password.  <br><br> If you did not send this request, it means someone is trying to access your account and you can disregard this email.`;

  async function main() {
    let info = await transport.sendMail({
      to: email,
      from: process.env.VERIFICATION_EMAIL,
      subject: "Reset Password Link",
      text: "hello world",
      html: generateTemplate({
        title: "Forgot Password",
        message,
        logo: "cid:logo",
        banner: "cid:forget_password",
        link,
        btnTitle: "ResetPassword",
      }),
      attachments: [
        {
          fileName: "logo.png",
          path: path.join(__dirname, "../mail/logo.png"),
          cid: "logo",
        },
        {
          filename: "forget_password.png",
          path: path.join(__dirname, "../mail/forget_password.png"),
          cid: "forget_password",
        },
      ],
    });
  }
  main().catch(console.error);
};

export const sendPassResetSuccessEmail = async (firstName, email) => {
  const __filename = fileURLToPath(import.meta.url);
  const __dirname = path.dirname(__filename);

  const transport = generateMailTransporter();

  const message = `Dear ${firstName}, your password has just been reset successfuly.  You can now sign in with your new password.`;

  transport.sendMail({
    to: email,
    from: process.env.VERIFICATION_EMAIL,
    subject: "Password Reset Successfully!",
    text: "hello world",
    html: generateTemplate({
      title: "Password Reset Successfully",
      message,
      logo: "cid:logo",
      banner: "cid:forget_password",
      link: process.env.SIGN_IN_URL,
      btnTitle: "Sign In",
    }),
    attachments: [
      {
        fileName: "logo.png",
        path: path.join(__dirname, "../mail/logo.png"),
        cid: "logo",
      },
      {
        filename: "forget_password.png",
        path: path.join(__dirname, "../mail/forget_password.png"),
        cid: "forgot_password",
      },
    ],
  });
};