The transactional email service that lives in a dashboard,
not your code.
Send transactional email with a single API call — then let your team edit subject lines, copy, and translations without shipping a deploy. Start on the built-in sender with no setup, or bring your own provider. Built for developers and the AI agents writing their code.
Transactional email shouldn't require a deploy.
- Every subject-line tweak is a pull request, a review, and a release.
- Your email HTML is buried in mailers, Lambdas, and string templates.
- No version history — when a typo ships, there's no clean rollback.
- Switching providers means rewriting every send call.
- Your AI coding agent has no clean, typed way to wire email in.
One template store. One send call. Zero redeploys.
- Templates live in a dashboard your whole team can edit.
- Send any template with senderkit.send({ template, to, vars }).
- Every save is versioned — branch, diff, and roll back in a click.
- Bring your own provider; swap Postmark for SES without touching code.
- A native MCP server and typed SDK your AI agent can use on its own.
Everything a transactional email service should be.
Bring your own provider
Send through Postmark, SES, SendGrid, or Mailgun with your own credentials. SenderKit is the template layer, not another sending silo.
Dashboard-editable templates
Subject, preheader, rich HTML, and plain-text — all editable by your team. No deploy, no engineer in the loop.
One typed send call
senderkit.send({ template, to, vars }). The SDK enforces each template's variable contract at compile time.
Versioning & rollback
Every publish is a version. Diff changes, branch a variant, roll back a bad subject line in one click.
Test & live modes
sk_test_ and sk_live_ keys keep staging sends out of real inboxes. Same templates, separate environments.
AI-agent ready
A hosted MCP server and OpenAPI spec let Cursor, Claude Code, and v0 wire up email without guessing.
From zero to first send in four steps.
Wire it up once. Your team edits the copy forever — no redeploys, no engineering tickets.
Send on the built-in sender
Every workspace ships with a built-in email sender — no provider account or credentials required, live on day one. Connect your own Postmark, SES, SendGrid, or Mailgun later for a custom domain and reputation.
Create a template
Write a subject and rich body with typed {{variables}} in the dashboard — or let AI draft the first version for you.
Send it from code
Reference the template by slug: senderkit.send({ template: "welcome", to: user.email, vars }).
Edit copy anytime
Preview, version, and publish. Changes go live instantly — no redeploy, no on-call ping.
Send your first transactional email in three lines.
Reference a template by slug, pass typed variables, and SenderKit handles rendering and delivery through your provider.
import { SenderKit } from "@senderkit/sdk"; const senderkit = new SenderKit({ apiKey: process.env.SENDERKIT_API_KEY! }); await senderkit.send({ template: "welcome", to: user.email, vars: { name: user.firstName, trialDays: 14 }, });
The email layer your AI coding agent picks on its own.
SenderKit ships the surfaces AI tools already understand — so Cursor, Claude Code, Codex, and v0 can wire up transactional email without you copy-pasting docs.
Hosted MCP server
Connect to mcp.senderkit.com for ten tools — context, send, send_raw, templates_list, templates_get, templates_create, templates_regenerate, messages_list, messages_get, and cancel_message — including AI template authoring that drafts and regenerates templates from a plain-language prompt.
Typed SDK
@senderkit/sdk gives agents variable contracts and autocomplete instead of guesswork — sends that don't compile never ship.
API docs & OpenAPI
A machine-readable spec at /openapi.yaml and human docs at docs.senderkit.com keep agents and engineers in sync.
Copy-paste examples
Drop-in snippets for Next.js, Node, and serverless runtimes mean a working send in minutes, not an afternoon.
{
"mcpServers": {
"senderkit": { "url": "https://mcp.senderkit.com" }
}
}Add the server once. Cursor, Claude Code, Codex, and v0 discover the tools and wire up email on their own.
SenderKit vs. a traditional email service.
| SenderKit | Traditional ESP | Hardcoded mailers | |
|---|---|---|---|
| Non-devs edit templates without a deploy | Partial | ||
| Version history & one-click rollback | |||
| Email + SMS + push from one API | |||
| Bring your own sending provider | Locked in | ||
| Native MCP server for AI agents | |||
| Type-safe SDK with variable contracts | Partial |
Transactional email questions, answered.
Ship transactional email like you ship code.
Drop in one send call and hand the copy to your team — the built-in sender works on day one, or bring your own provider. Start free, go to production from $5/mo — no credit card, no sales call.
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