Developers
Three lines to your first send.
One API for every surface — REST, SMTP, MCP, webhooks. Built for people who read docs once and ship.
REST API
Send, query, and manage everything. JSON over HTTPS, predictable errors, idempotency keys.
SMTP
Point any existing mailer at smtp.sendflit.com — routed, DKIM-signed, and audited like every other send.
MCP server
13 governed tools for agents: draft, segment, schedule, analyze. Approval gates enforced server-side.
Webhooks
Delivered, opened, bounced, complained — signed payloads, automatic retries, replay protection.
Templates
Versioned HTML templates with variables. Preview renders via API before you send.
SDKs
Node, Python, and Go first-class. Typed, tested, and semver'd.
curl -X POST https://api.sendflit.com/v1/email \
-H "Authorization: Bearer sfk_live_…" \
-d '{"from":"billing@acme.com","to":"cus@acme.com","template":"invoice"}'import { SendFlit } from "@sendflit/node";
const sf = new SendFlit(process.env.SENDFLIT_API_KEY);
await sf.emails.send({
from: "billing@acme.com",
to: "cus@acme.com",
template: "invoice",
vars: { id: 4821 },
});# register once — the agent discovers all 13 governed tools claude mcp add sendflit \ --transport http \ https://api.sendflit.com/mcp
POST /hooks/email.delivered
{
"type": "email.delivered",
"email": { "id": "em_9f2", "to": "cus@acme.com" },
"at": "2026-09-24T12:10:32Z"
}Get your API key.
Create an account and send a test email in the next five minutes.