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SSendSignal
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The email platform for products that ship

Send transactional and marketing mail through a clean API. Inspect delivery, manage audiences, and operate domains from one console.

Start sendingRead the API docs

3,000 emails/month free. No credit card required.

Send, inspect, operate

One API call puts a message on the wire; the console shows you everything that happens to it afterward, and keeps the domains underneath it healthy.

Send

REST, SMTP, templates, and broadcasts. Queue a message and watch it land through Amazon SES.

Inspect

Events, webhooks, and API logs for every message.

Operate

Domains, keys, contacts, and suppressions in one place.

Free deliverability tools→

SPF, DKIM, DMARC, and DNSBL checks, header analysis, and DNS lookups. No account needed, at tools.sendsignal.dev.

And everything after hello-world

Broadcasts & automationsTarget a segment or topic, schedule it, or trigger event-driven workflows: on contact created, delivered, opened, clicked, or received.
Inbound parsingPoint MX at us and received mail arrives parsed (headers, bodies, and attachments), ready to read via API or to trigger an automation.
Verified domainsDKIM, SPF, and tracking records provisioned for you; verification polls until DNS is right. BIMI logos supported out of the box.
Suppression built inBounces and complaints are suppressed automatically, and every send is checked against the list before it leaves.
One-click unsubscribeRFC 8058 List-Unsubscribe headers and signed unsubscribe links added to every marketing send: the Gmail/Yahoo requirement, handled.
SDKs & toolingTypeScript, Python, and Go SDKs, a CLI, an MCP server for agents, and free deliverability tools at tools.sendsignal.dev.

Three lines to your first send

First-class SDKs for TypeScript (@sendsignal/sdk), Python (sendsignal, zero dependencies), and Go, plus a drop-in SMTP relay for anything that already speaks SMTP: set the password to your API key and you're done.

Prefer raw HTTP? The whole surface is a clean REST API with an OpenAPI spec and an interactive reference.

import { SendSignal } from "@sendsignal/sdk";

const sendsignal = new SendSignal("ss_...");

await sendsignal.emails.send({
  from: "Acme <hi@acme.com>",
  to: "user@example.com",
  subject: "Hello",
  html: "<p>Hi</p>",
});

Start sending in minutes

3,000 emails a month free, a real test mode, and a console that shows you exactly what happened to every message.

Start sendingRead the API docs

No credit card required. Delivery runs on Amazon SES infrastructure; uptime at status.sendsignal.dev.