PostStack

poststack.dev

EU-hosted email API for sending transactional and marketing email with contacts, broadcasts, templates, domains, mailboxes, and analytics via REST, SMTP, or MCP.

The PostStack API uses bearer token authentication; has freemium pricing; offers a free tier (€0/mo — 3,000 emails/month, 1 domain, forever free, no credit card required). Verified 2026-07-08 with per-field source links.

Communication Verified 2026-07-08 high confidence

Base URL

https://api.poststack.dev

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Auth

bearer_token

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Free tier

€0/mo — 3,000 emails/month, 1 domain, forever free, no credit card required

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Pricing model

freemium

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Pricing

Free €0 (3,000 emails); Starter €5/mo (10,000); Pro €15/mo (50,000); Scale €30/mo (100,000); Enterprise custom. Overage €0.25 per 1,000 emails; mailboxes €1/mo each; dedicated IP €25/mo. Prices exclude VAT.

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Rate limits

not documented null

no source

OpenAPI spec

https://poststack.dev/openapi.json

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MCP server

Hosted streamable-http MCP server at https://poststack.dev/api/mcp (manifest at /.well-known/mcp.json); local install via npx @poststack.dev/mcp; 72+ tools

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