Get started

Deckle documentation

Deckle is a design-first email platform — the developer experience of a modern email API with the audience, templates, and automations of a marketing tool. Send transactional and marketing email from your own domain.

Everything you send goes out from a domain you own and verify, so your reputation stays yours. Start with a single API call, then grow into contacts, campaigns, and event-driven automations without changing tools.

import { Deckle } from "@deckle/sdk";

const deckle = new Deckle(process.env.DECKLE_API_KEY!);

await deckle.emails.send({
  from: "Acme <hello@acme.com>",
  to: "jane@example.com",
  subject: "Welcome to Acme 👋",
  html: "<h1>Hey Jane</h1><p>Thanks for joining.</p>",
});

New to Deckle?

Follow the Quickstart to send your first email in under five minutes, then verify a domain to start sending to real inboxes.

Built for LLMs. For all documentation in an index, see llms.txt. To read the full text of the documentation, see llms-full.txt.

Start building#

Jump straight to what you need.

Quickstart

Create a key and send your first email with the SDK, HTTP, or SMTP.

Send email

Transactional sends, templates, variables, attachments, and idempotency.

Audience

Manage contacts, track events, build segments, and handle suppressions.

Automations

Trigger multi-step email flows from events and subscriptions.

Domains & deliverability

Verify a domain with DKIM, SPF, and DMARC to protect your reputation.

API reference

Every endpoint, parameter, and response for the Deckle REST API.

What you can build#

Deckle covers the full lifecycle of the email you send — from a one-off password reset to a recurring newsletter to a lifecycle automation that reacts to what your users do.

Transactional email

Receipts, magic links, and alerts over the API, SMTP, or SDK.

Marketing campaigns

Broadcast to your whole list or a segment, with A/B subject lines.

Beautiful templates

A gallery of clean, deliverability-safe templates you can brand and reuse.

How it fits together#

Under the hood, Deckle runs on Amazon SES and layers an event-driven core on top: contacts are keyed by email, events record what they do, and automations react to those events. That single primitive is what turns a send API into a marketing platform. Read How Deckle works for the full picture.

Base URL

The API is served at https://app.getdeckle.com/api/v1. All requests are authenticated with a secret API key — see API keys.