Built on Amazon SES · Your own domain · Free to start

Email for developers, agents and marketing.

One platform to send from your code, give AI agents inboxes they can safely work in, and reach customers with templates that are ready on day one.

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3,000 emails a month free. No card. Sign in with Google or a magic link.

POST /api/v1/emails
curl -X POST mail.flinkk.io/api/v1/emails \
  -H "Authorization: Bearer $KEY" \
  -H "Idempotency-Key: order-1042" \
  -d '{
    "from": "Acme <hi@acme.com>",
    "to": "sam@example.com",
    "template": "order-confirmation",
    "variables": { "order_number": "#1042" }
  }'

// 200  { "id": "ckx9…" }

One platform, three ways to send

Use the part you need today. They share your domain, your templates and one delivery log.

For developers

A transactional API that stays out of your way

  • One JSON POST, single or batch of 100
  • Templates with variables, idempotency keys
  • Signed webhooks, delivery logs, OpenAPI spec
  • Node and Python clients
Explore the API

For agents

Inboxes your AI agents can work in

  • Hosted MCP server for Claude, ChatGPT and Cursor
  • Draft-only by default, a person approves
  • Per-inbox scopes, send limits, audit log
  • Templates keep the wording consistent
See how agents work

For marketing

Campaign templates that look finished

  • Newsletter, launch, sale, event, win-back
  • Unsubscribe link and address built in
  • Live preview on desktop and mobile
  • Send to your list with the batch API
See plans

Start from a template, not a blank page

Twenty-one ready-made templates for sending, replying and campaigns. Preview them live, make your own copy and edit.

Open the template studio

  • Welcome

    First email after sign-up.

    API

  • Order confirmation

    Order received, with total.

    API

  • Support reply

    Answer a customer question, with a clear next step and a human fallback.

    Agent

  • Booking confirmation

    Hotel or service booking confirmed.

    API

  • Newsletter

    A headline, an intro and three items.

    Marketing

  • Sale or promotion

    A discount with a code and a deadline.

    Marketing

Agents that cannot go rogue

Email is untrusted input and agents can be fooled. So the limits live on the server, not in the prompt: the agent can only do what you granted.

Draft-only by default

The agent writes; a person approves each message before it is sent.

Per-inbox permissions

Read, draft, send and label are granted separately, per inbox.

Daily send limits

A hard cap per agent and inbox, enforced on the server.

Reply-only mode

The agent can only answer people already in the thread.

Untrusted by design

Email content is labelled as untrusted so a hostile message cannot give orders.

Full audit log

Every agent action and approval is recorded.

Connect Claude or CursorAgent API docs

Pricing you can read in ten seconds

Every plan has the full API, templates, agent inboxes and the MCP server. You pay for volume, never per seat.

Free

$0/ month

  • 3,000 emails a month
  • 3 sending domains
  • 3 agent inboxes
  • Up to 100 a day
Start free
Most popular

Pro

$15/ month

  • 50,000 emails a month
  • 10 sending domains
  • 10 agent inboxes
  • $0.60 per extra 1,000
See details

Scale

$79/ month

  • 250,000 emails a month
  • 100 sending domains
  • 50 agent inboxes
  • $0.45 per extra 1,000
See details

Send your first email in five minutes

Add a domain, copy an API key, and call one endpoint. Or give an agent its own inbox.

Start free Read the docs