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PostStack

European email API platform for developers and AI agents. Send transactional and marketing emails via REST API, SMTP, or MCP server. EU-hosted infrastructure in Finland. 3,000 emails free every month, paid plans from €5.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-24T20:52:29.382Z. Cached copy · Source on poststack.dev

# PostStack

> European email API platform for developers and AI agents. Send transactional and marketing emails via REST API, SMTP, or MCP server. EU-hosted infrastructure in Finland. 3,000 emails free every month, paid plans from €5.

PostStack is a Danish company. All data is processed and stored in the EU. GDPR compliant by design.

## Docs

- [Full API Reference](https://poststack.dev/llms-full.txt): Complete API documentation with all endpoints, schemas, and examples
- [OpenAPI 3.1 Spec](https://poststack.dev/openapi.json): Machine-readable API schema
- [Web Docs](https://poststack.dev/docs): Interactive documentation
- [MCP Server](https://poststack.dev/docs/mcp): Model Context Protocol server for AI assistants
- [MCP Discovery](https://poststack.dev/.well-known/mcp.json): Hosted MCP manifest (transport URL, auth methods, scopes)

## Quick Start

Install the SDK:

```bash
npm install @poststack.dev/sdk
```

Send your first email:

```typescript
import { PostStack } from '@poststack.dev/sdk';

const poststack = new PostStack('sk_live_...');

await poststack.emails.send({
  from: 'you@yourdomain.com',
  to: ['user@example.com'],
  subject: 'Hello',
  html: '<p>Welcome!</p>',
});
```

## MCP Server (AI Agents)

Connect PostStack to Claude, Cursor, Windsurf, and other AI assistants:

```bash
claude mcp add poststack -e POSTSTACK_API_KEY=sk_live_... -- npx -y @poststack.dev/mcp
```

72 tools covering the full API surface — send emails, manage contacts, domains, templates, broadcasts, and more via natural language.

## API Sections

- **Authentication**: Bearer token auth with API keys (`sk_live_...` or `sk_test_...`)
- **Emails**: Send single/batch emails, schedule, cancel, list with filtering
- **Domains**: Add and verify sending domains (SPF, DKIM, DMARC), configure tracking
- **Contacts**: Create, import (CSV), export, manage subscribers with custom properties
- **Templates**: Reusable email templates with `{{variable}}` placeholders and versioning
- **Broadcasts**: Bulk email campaigns to segments/topics with scheduling and analytics
- **Segments**: Dynamic (rule-based) and manual audience segmentation
- **Subscription Topics**: Fine-grained email preference management per contact
- **Workflows**: Automated email sequences triggered by contact events
- **Tracking**: Open and click tracking with custom domains, client/location detection
- **Inbound Email**: Receive emails via MX records and webhook notifications
…

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Machine-readable: GET /v1/resolve?q=poststack.dev · GET /v1/domain/poststack.dev · this page as Accept: application/json or text/markdown · MCP lookup_domain

Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.

Claim my listing on Agent Web Map for poststack.dev:
1. POST https://agentwebmap.com/v1/sites/poststack.dev/claims and keep claim_id and claim_secret private.
2. Publish the verification line "AgentWebMap verification: <token>" (token from step 1) in https://poststack.dev/llms.txt, or use the DNS, meta-tag or well-known method the response describes. This only verifies the listing; your website and domain remain yours.
3. POST https://agentwebmap.com/v1/sites/poststack.dev/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/poststack.dev).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

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