borgwarehouse/services/notif.service.ts

import nodemailer, { Transporter } from 'nodemailer';
import SMTPTransport from 'nodemailer/lib/smtp-transport';

export const NotifService = {
  nodemailerSMTP(): Transporter {
    const config: SMTPTransport.Options = {
      port: parseInt(process.env.MAIL_SMTP_PORT || '587', 10),
      host: process.env.MAIL_SMTP_HOST,
      tls: {
        // false value allow self-signed or invalid TLS certificate
        rejectUnauthorized: process.env.MAIL_REJECT_SELFSIGNED_TLS === 'false' ? false : true,
      },
    };

    const smtpLogin = process.env.MAIL_SMTP_LOGIN || '';
    const smtpPwd = process.env.MAIL_SMTP_PWD || '';

    // Some SMTP servers doesn't require authentication #364
    if (smtpLogin) {
      config.auth = {
        user: smtpLogin,
        pass: smtpPwd,
      };
    }

    const transporter: Transporter = nodemailer.createTransport(config);
    return transporter;
  },
};