Email infrastructure for developers

Send transactional and marketing email at scale with first-class deliverability, zero-config DKIM, and an API your team will actually enjoy using.

Start sending free View docs

No credit card required1,000 emails / month freeSOC 2 in progress

POST /api/v1/emails

queue active

Compose

HTML/template

Domain

sender.example

Audience

2,481 contacts

Delivered emailDelivered

to ada@stellar.io·87ms

INBOXWelcome aboard — your account is ready

200queued

Managed Sendix delivery stack

Direct MX deliveryVerified domainsDKIM signingWebhook eventsRegion routingQueue workersBounce loggingAPI keysCloudflare DNSAdmin controlsDirect MX deliveryVerified domainsDKIM signingWebhook eventsRegion routingQueue workersBounce loggingAPI keysCloudflare DNSAdmin controls

One platform, every email primitive

Send. Track. Verify. Repeat.

Five capabilities, one API surface, zero context switching.

Developer experience

A send API engineered for ergonomics

Pass JSX directly. We render, sanitize, inline, and ship dark-mode variants for you. Idempotency keys, structured errors, and stable IDs ship as defaults.

Read the API reference

send.ts

await sendix.emails.send({
  from: 'billing@sender.example',
  to: 'recipient@customer.example',
  subject: 'Welcome 🎉',
  react: <Welcome />,
})

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01 / 05Auto-rotatingAll features

How it works

Every email, traced end to end

From the API call to the recipient's inbox — five stages, fully observable, every event signed.

Step 1

API request

POST /api/v1/emails

{ "from": "billing@sender.example",
  "to": "recipient@customer.example",
  "subject": "Welcome 🎉",
  "react": <Welcome /> }

Step 2

Auth & validate

rl: 100/s

· API key scoped to verified domain
· Rate limit ok (4 / 100)
· Sender allow-list ✓

Step 3

Sign & route

DKIM

SPFaligned

DKIM2048-bit signed

Step 4

Queue & dispatch

BullMQ

queued

Step 5

Deliver

verified queue

Domainverified

DKIMsigned

Delivered in 87ms

Developer experience

Send your first email in two minutes

Native direct-MX delivery, no local MTA to install, no DNS guesswork. Drop the SDK in, paste your key, ship.

Node SDK + REST
Use the Node package where it fits, or call the documented JSON API directly from any runtime.
Templates or raw HTML
Send with a template id, HTML, text, scheduled time, tags, and attachments through the same endpoint.
Predictable responses
Stable IDs, idempotency keys, structured errors — boring on purpose.

send.js

import { Sendix } from '@sendix/sdk';

const sendix = new Sendix({ apiKey: process.env.SENDIX_KEY });

const { id } = await sendix.emails.send({
  from: 'noreply@yourdomain.com',
  to: ['customer@yourdomain.com'],
  subject: 'Welcome aboard!',
  html: '<h1>Hi there</h1><p>Thanks for signing up.</p>',
});

console.log('Queued:', id);

Switch with confidence