Open source sending infrastructure for developers

Send transactional, marketing emails, SMSes and push notifications effortlessly.


Reach your users

Transactional Mail

  • Simple to use! No wasted time on configuration.
  • Send emails that reach the inbox, not spam.
  • Get notified of email bounces and complaints.
Jun 24, 10:43 PM
We received your request and sent the email to recipient's server.
Jun 24, 10:45 PM
Mail is successfully delivered to the recipient.

Marketing Mail

  • Manage newsletters, changelogs, and broadcasts easily.
  • Use our no-code email builder and templates that works on all email clients.
  • Measure engagement using click and open tracking.
  • Focus on the content and we will handle the subscription for you.
Welcome to unsend!

Finally an open source alternative for Resend, Mailgun, Sendgrid and postmark.

Integrate in minutes

const requestOptions = {
  method: "POST",
  headers: {
    "Accept": "application/json",
    "Content-Type": "application/json",
    "Authorization": "Bearer us_1a2b3c4d5e6f7f8g"
  body: JSON.stringify({
    "to": "[email protected]",
    "from": "[email protected]",
    "subject": "Unsend email",
    "html": "<p>Unsend is the best open source product to send emails</p>"

fetch("", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.error(error));