使用Nodemailer通过Hostinger批量发邮件遇投递失败问题求助

尝试向超过50个邮箱的列表发送邮件时，前约10封可正常发送，但一段时间后出现投递失败错误。错误提示如下：

您的邮件未送达，因为目标邮件系统出于安全或策略原因拒绝了您的邮件。例如，该邮箱地址可能仅接受特定发件人的邮件，或不接受特定类型的邮件（如超过特定大小的邮件）。

请联系收件人（例如通过电话），并与他们及其邮件管理员合作，确定是什么策略或设置阻止了您的邮件，以及您应采取什么措施确保未来的邮件不会被拒收。

以下是我的代码：

const path = require("path");
const nodemailer = require("nodemailer");
const hbs = require("nodemailer-express-handlebars");
require('dotenv').config();
// const { mail_list } = require("./csvjson");
const { mail } = require("./testing");


const filteredMail = mail;

const sendMail = (name, email, indx) => {
  return new Promise((resolve, reject) => {
    try {
      const transporter = nodemailer.createTransport({
        host: process.env.EMAIL_SERVICE,
        port: parseInt(process.env.EMAIL_PORT),
        secure: parseInt(process.env.EMAIL_PORT) == 465,
        secureConnection: false,
        tls: {
          ciphers: "SSLv3",
        },
        requireTLS: true,
        auth: {
          user: process.env.EMAIL_USER,
          pass: process.env.EMAIL_PASSWORD,
        },
        pool: true,
        connectionTimeout: 10000,
        maxConnections: 1, // Use one connection at a time
        maxMessages: 3, // Send a max of 3 messages per connection
        // logger: true,
        // debug: true
      });

      const handlebarOptions = {
        viewEngine: {
          extName: ".handlebars",
          partialsDir: path.resolve("./views"),
          defaultLayout: false,
        },
        viewPath: path.resolve("./views"),
        extName: ".handlebars",
      };

      transporter.use("compile", hbs(handlebarOptions));

      const mailOptions = {
        from: process.env.EMAIL_USER,
        to: email,
        subject: "Ok",
        template: "email",
        context: {
          title: "Ok",
          email: email,
          name: name,
        }
      };

      transporter.sendMail(mailOptions, (error, info) => {
        if (error) {
          console.error(`Error sending email: ${indx}:`, error.message);
          reject(error);
        } else {
          console.log(`Success: ${indx} : ${email}`);
          resolve(info);
        }
      });
    } catch (error) {
      console.error(`Error setting up email: ${indx}:`, error.message);
      reject(error);
    }
  });
};

const sendAllMails = (indx = 0) => {
  if (indx < filteredMail.length) {
    sendMail(filteredMail[indx].Name, filteredMail[indx].Email, indx)
      .then(() => {
        setTimeout(() => {
          sendAllMails(indx + 1);
        }, 15000); // 5000 milliseconds = 5 seconds
      })
      .catch(() => {
        setTimeout(() => {
          sendAllMails(indx); // Retry the same index
        }, 180000); // 180000 milliseconds = 3 min
      });
  }
};

sendAllMails();

我的环境配置如下：

EMAIL_SERVICE = "smtp.hostinger.com"
EMAIL_PORT = 465
EMAIL_USER = "email"
EMAIL_PASSWORD = "password"

我拥有Hostinger商务高级邮箱套餐，恳请各位帮忙解决该问题。

内容的提问来源于stack exchange，提问作者MAYANK KUMAR