The email tool for developers

An open source suite of developer tools to manage all of your app's email needs.

Powerful & flexible templating

Build your email templates in Markdown, HTML, MJML, or ReactJS.

Your favorite templating languages

Create emails with Markdown, HTML, MJML, or JSX

Powerful templating engines

Support for Handlebars, Liquid, EEx, or React

Preview instantly

Preview your templates in realtime, with multiple clients


###############################################
# template: `onboarding:welcome`
###############################################

  Hi {{name | default: "there"}},

  Thanks for signing up for {{company}}!

  To get started with {{company}}, head on over
  to the [dashboard]({{onboarding_url}}).

  I'm Alex, one of the founders. If you have
  any questions, feedback, or need any help
  getting started, don't hesitate to reach out!

  Best,
  Alex

Use any of your favorite email API clients

We support all the most popular email API clients, including Amazon SES and Gmail.

Want to start with Gmail, or switch from Mailgun to SES? No problem.

const mailer = require('@mailbox/core')(
  process.env.MAILBOX_API_KEY
);

mailer.send({
  from: "team@acme.inc",
  to: "alex@example.com",
  subject: "Welcome to Acme Inc",
  template: "onboarding:welcome",
  // Set dynamic data fields to populate template
  data: {
    name: "Alex",
    company: "Stripe"
  },
  // Easily switch between email API clients
  adapter: "ses",
  // Schedule email to be sent out in 40 mins
  schedule_in: 40 * 60,
  // Validate 'to' address before sending out
  validate: true, 
  // Ensure email only sent once with above params
  idempotent: true,
});

Ready to get started?

Coming soon

Spelling & grammar checking
Internationalization & localization
WYSIWYG editor
On-premise hosting
...and much more!