Email API · EU-hosted · GDPR compliant
Email infrastructure, handled
Send transactional and marketing email via REST API, SMTP, or MCP. Self-hosted Postfix infrastructure in Germany and Finland. Up to 75% cheaper than Resend, SendGrid, and Postmark.
› "draft and send a personalised welcome to ada@lovelace.io"
Everything you need for email
REST API, SMTP relay, templates, contacts, broadcasts, analytics, and built-in mailboxes. One platform.
Developers + Teams
One POST request to send an email. TypeScript, Python, and Go SDKs. MCP server for Claude, Cursor, and other AI assistants — and a dashboard your team can actually use.
Deliverability
SPF, DKIM, and DMARC set up automatically when you add a domain. Bounce and complaint handling runs in the background.
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 & Webmail
Full email hosting with built-in webmail. Create mailboxes on your domain, read and send from the dashboard, or connect any email client via IMAP or POP3.
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.
Trusted by Danish SaaS teams
Production email for indie makers, startups, and operators across Denmark.
Frequently asked questions
Everything you need to know before your first send.
Where is PostStack hosted?
Germany and Finland. All email data stays inside the EU and is not subject to the US CLOUD Act.
Do you offer a free tier?
3,000 emails per month free forever. No credit card required to start.
Can I migrate from Resend, SendGrid, or Postmark?
Yes. PostStack offers drop-in SDK compatibility and dedicated migration guides for each provider at /migrate/resend, /migrate/sendgrid, and /migrate/postmark.
Is PostStack GDPR compliant?
Yes, by design. PostStack runs only on EU infrastructure, processes no data outside the EU, and provides a signed Data Processing Agreement at /dpa.
Do you support SMTP in addition to the REST API?
Yes. The SMTP relay works with WordPress, Laravel, Rails, nodemailer, and any SMTP client. Use your API key as the password — see /docs/smtp.
How does PostStack compare to Resend on price?
Up to 75% cheaper at every paid tier. See the full side-by-side comparison at /pricing/compare.
Do you support MCP, Claude, and AI agents?
Yes. PostStack ships a first-class MCP server for Claude, Cursor, and other AI assistants. Setup guide at /docs/mcp.
Start free. Paid plans from just €5/mo.
The cheapest email API in Europe. 3,000 emails free forever. Paid plans from €5 — up to 75% cheaper than Resend, SendGrid, and Postmark.
Free
For side projects and testing
- 3,000 emails/month
- 1 domain
- 5 API keys
- 14-day log retention
- Webhooks
Starter
For indie makers and small SaaS
- 10,000 emails/month
- 3 domains
- 10 API keys
- 14-day log retention
- Webhooks
Pro
For startups and growing products
- 50,000 emails/month
- 10 domains
- 50 API keys
- 10 mailboxes with webmail
- 30-day log retention
- Webhooks
- Up to 1 dedicated IP
Enterprise
Custom volumes, dedicated infrastructure, SLA, and priority support for high-scale senders.
- Unlimited emails/month
- Unlimited domains
- Unlimited API keys
- Unlimited mailboxes
- Unlimited log retention
- Dedicated IP pool
- Priority support & SLA
- Custom contracts