Email infrastructure, handled
Transactional and marketing email via REST API or SMTP. Built on European infrastructure. Priced 20-30% below Resend and SendGrid.
curl -X POST https://api.poststack.dev/api/emails \
-H "Authorization: Bearer sk_live_..." \
-H "Content-Type: application/json" \
-d '{
"from": "hello@yourdomain.com",
"to": "user@example.com",
"subject": "Welcome aboard!",
"html": "<h1>Welcome!</h1>"
}'Everything you need to send email
REST API, SMTP relay, templates, contacts, broadcasts, and analytics. One platform.
Developer First
One POST request to send an email. TypeScript, Python, and Go SDKs. MCP server for Claude, Cursor, and other AI assistants. Webhooks for every event.
Deliverability Built In
SPF, DKIM, and DMARC set up automatically when you add a domain. Bounce and complaint handling runs in the background.
Real-Time Analytics
Opens, clicks, deliveries, bounces, and complaints — tracked in real time. Live dashboard and webhook events.
Templates
Handlebars variables and React Email support. Preview, version, and ship without redeploying.
Contacts & Broadcasts
Import contacts, build audiences, and send broadcasts. Segment by tags or custom fields. Scheduling and one-click unsubscribe included.
Mailboxes
Full email hosting on your domain. Create mailboxes, connect Thunderbird or Apple Mail. Autodiscovery handles client setup.
SMTP Relay
Standard SMTP that works with any client. WordPress, Laravel, Rails, or your AI agent. Use your API key as the password.
Webhooks
Real-time notifications for every email event. Deliveries, bounces, opens, clicks, and complaints — HMAC-signed.
European Infrastructure
Data centers in Germany and Finland. GDPR compliant by design. Your email data stays in the EU — not subject to the US CLOUD Act.
Simple pricing. No surprises.
Start free with 3,000 emails/month. Upgrade when you need to. 20-30% below Resend and SendGrid.
Free
For side projects and testing
- 3,000 emails/month
- 1 domain
- 5 API keys
- 14-day log retention
- Webhooks
Pro
For startups and growing products
- 50,000 emails/month
- 10 domains
- 50 API keys
- 10 mailboxes
- 30-day log retention
- Webhooks
- Up to 1 dedicated IP