Transactional email API

What it is

SuperSend TX is a transactional email platform for developers: create an API key, verify a domain, and send with POST /emails or npm install supersendtx. It is built for product email — not cold outbound, not newsletters.

First send

npm install supersendtx

import { SuperSendTX } from 'supersendtx'

const client = new SuperSendTX(process.env.SUPERSENDTX_API_KEY)
await client.emails.send({
  from: 'noreply@yourdomain.com',
  to: 'user@example.com',
  subject: 'Welcome',
  html: '<p>You are in.</p>',
})

Full walkthrough: Quickstart.

Infrastructure tiers

• Sandbox — free, capped test sends while you integrate
• Pro — from $20/mo on our shared transactional network (10 domains)
• Scale — volume slider with declining overage (up to 1,000 domains)
• Dedicated — from $299/mo managed servers and IPs when you need isolation

We run the mail servers. We do not resell Amazon SES as the product. Details on pricing.

Common jobs

• Password reset and verification emails
• Supabase Auth email
• Clerk and Auth.js email
• Receipts, invoices, alerts — same emails.send path

Moving from another provider

Field-for-field migration guides for Resend, Postmark, and Amazon SES.