Nodemailer fails with Client network socket disconnected before... even locally

Hey,

I am trying to use

nodemailer

nodemailer

nodemailer

nodemailer within deno (2.0.4), and I am unable to figure out why it doesn't work.

I made a minimal example (ethereal credentials specifically for this example):

import nodemailer from 'npm:nodemailer';

const testMail = async () => {
  const transporter = nodemailer.createTransport({
    host: "smtp.ethereal.email",
    port: 587,
    secure: false, // Use `true` for port 465, `false` for all other ports
    auth: {
      user: "tess3@ethereal.email",
      pass: "K9S6HKVEg8bDtVNnnr",
    },
    logger: true,
  });

  return transporter.verify();
}

testMail();

import nodemailer from 'npm:nodemailer';

const testMail = async () => {
  const transporter = nodemailer.createTransport({
    host: "smtp.ethereal.email",
    port: 587,
    secure: false, // Use `true` for port 465, `false` for all other ports
    auth: {
      user: "tess3@ethereal.email",
      pass: "K9S6HKVEg8bDtVNnnr",
    },
    logger: true,
  });

  return transporter.verify();
}

testMail();

import nodemailer from 'npm:nodemailer';

const testMail = async () => {
  const transporter = nodemailer.createTransport({
    host: "smtp.ethereal.email",
    port: 587,
    secure: false, // Use `true` for port 465, `false` for all other ports
    auth: {
      user: "tess3@ethereal.email",
      pass: "K9S6HKVEg8bDtVNnnr",
    },
    logger: true,
  });

  return transporter.verify();
}

testMail();

import nodemailer from 'npm:nodemailer';

const testMail = async () => {
  const transporter = nodemailer.createTransport({
    host: "smtp.ethereal.email",
    port: 587,
    secure: false, // Use `true` for port 465, `false` for all other ports
    auth: {
      user: "tess3@ethereal.email",
      pass: "K9S6HKVEg8bDtVNnnr",
    },
    logger: true,
  });

  return transporter.verify();
}

testMail();

This fails with

Client network socket disconnected before secure TLS connection 
was established

Client network socket disconnected before secure TLS connection 
was established

Client network socket disconnected before secure TLS connection 
was established

Client network socket disconnected before secure TLS connection 
was established

independent of the "secure" setting. If I run this same snipped with node, there is no problem.

Does somebody have an idea?

Best,
Kalle

Nodemailer fails with Client network socket disconnected before... even locally

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