Point your mailer at the sandbox

If your app can send through SMTP, it works with MailBench SMTP. Change the host, port, username and password, and every message lands in your inbox instead of being delivered.

Laravel

Laravel reads SMTP settings from .env. Change these in your staging or CI environment.

.env

MAIL_MAILER=smtp
MAIL_HOST=smtp.example.com
MAIL_PORT=587
MAIL_USERNAME=your-inbox-user
MAIL_PASSWORD=your-inbox-pass
MAIL_ENCRYPTION=tls

Next.js and Node.js (Nodemailer)

Create one transport and reuse it from route handlers, server actions or API routes. Keep the credentials in environment variables.

mailer.ts (Nodemailer, works in Next.js route handlers and server actions)

import nodemailer from 'nodemailer';

export const transport = nodemailer.createTransport({
  host: process.env.SMTP_HOST,      // smtp.example.com
  port: Number(process.env.SMTP_PORT ?? 587),
  secure: false,                    // STARTTLS on 587; use true with port 465
  auth: {
    user: process.env.SMTP_USER,    // your-inbox-user
    pass: process.env.SMTP_PASS,    // your-inbox-pass
  },
});

Ruby on Rails

Set Action Mailer to SMTP in the environment you want to capture, such as staging.

config/environments/staging.rb

config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  address: 'smtp.example.com',
  port: 587,
  user_name: ENV['SMTP_USER'],   # your-inbox-user
  password: ENV['SMTP_PASS'],    # your-inbox-pass
  authentication: :plain,
  enable_starttls_auto: true
}

Django

Use the SMTP backend and point it at your inbox.

settings.py

import os

EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'smtp.example.com'
EMAIL_PORT = 587
EMAIL_USE_TLS = True  # STARTTLS
EMAIL_HOST_USER = os.environ['SMTP_USER']      # your-inbox-user
EMAIL_HOST_PASSWORD = os.environ['SMTP_PASS']  # your-inbox-pass

Any other SMTP client

Everything you need to configure a mailer that speaks SMTP.

Host:      smtp.example.com
Ports:     587 (STARTTLS), 465 (TLS), 2525 (STARTTLS, if 587 is blocked)
Username:  your-inbox-user
Password:  your-inbox-pass
Auth:      PLAIN or LOGIN