Fake SMTP Server

const nodemailer = require('nodemailer');

const transport = nodemailer.createTransport({
  host: "sandbox.truesend.io",
  port: 2525,
  auth: {
    user: "ts_test_a1b2c3",
    pass: "your_password"
  }
});

transport.sendMail({
  from: "dev@yourapp.com",
  to: "user@example.com",
  subject: "Test Email",
  text: "Captured in sandbox!"
});

// PHPMailer
use PHPMailer\PHPMailer\PHPMailer;

$mail = new PHPMailer(true);
$mail->isSMTP();
$mail->Host = 'sandbox.truesend.io';
$mail->Port = 2525;
$mail->SMTPAuth = true;
$mail->Username = 'ts_test_a1b2c3';
$mail->Password = 'your_password';

$mail->setFrom('dev@yourapp.com');
$mail->addAddress('user@example.com');
$mail->Subject = 'Test Email';
$mail->send();

import smtplib
from email.message import EmailMessage

msg = EmailMessage()
msg['From'] = 'dev@yourapp.com'
msg['To'] = 'user@example.com'
msg['Subject'] = 'Test Email'
msg.set_content('Captured in sandbox!')

with smtplib.SMTP(
    'sandbox.truesend.io', 2525
) as server:
    server.login('ts_test_a1b2c3', 'pass')
    server.send_message(msg)

require 'net/smtp'

message = <<~MSG
  From: dev@yourapp.com
  To: user@example.com
  Subject: Test Email

  Captured in sandbox!
MSG

Net::SMTP.start(
  'sandbox.truesend.io',
  2525,
  'yourapp.com',
  'ts_test_a1b2c3',
  'your_password',
  :plain
) do |smtp|
  smtp.send_message(message,
    'dev@yourapp.com',
    'user@example.com')
end