---
title: "Unitpost — email for developers and the agents they build"
description: "Send transactional and marketing email over REST, SMTP, or MCP. Contacts, segments, templates, domains, webhooks, suppressions — one platform, flat pricing."
url: https://www.unitpost.com/
section: "Home"
updated: 2026-08-17
---

# Unitpost

> Unitpost is an email platform for developers: transactional and marketing email, contacts, segments, topics, templates, sending domains, inbound email, webhooks, and suppressions — over a REST API, official SDKs (Node.js, Python, Ruby), an SMTP relay, or the MCP server for AI agents.

## Start here

- [Docs](https://www.unitpost.com/docs) — API and SDK guides ([Markdown](https://www.unitpost.com/docs.md))
- [Quickstart](https://www.unitpost.com/docs/quickstart) — first send in minutes
- [Pricing](https://www.unitpost.com/pricing) — flat monthly price, allowance included ([Markdown](https://www.unitpost.com/pricing.md))
- [OpenAPI 3.1](https://www.unitpost.com/api/v1/openapi.json) — machine-readable API contract
- [llms.txt](https://www.unitpost.com/llms.txt) — curated agent index · [llms-full.txt](https://www.unitpost.com/llms-full.txt) — full text, one fetch

## Products

- [Transactional email](https://www.unitpost.com/transactional) — receipts, resets, alerts; idempotent sends, signed webhooks
- [Marketing email](https://www.unitpost.com/marketing-emails) — campaigns priced per send, never per contact
- [SMTP relay](https://www.unitpost.com/smtp) — point any app at smtp.unitpost.com
- [Contacts & segments](https://www.unitpost.com/contacts) — unlimited contacts on paid plans
- [Webhooks](https://www.unitpost.com/webhooks) — signed delivery/bounce/complaint/open/click events
- [Inbound email](https://www.unitpost.com/inbound) — receive and parse mail
- [Email design suite](https://www.unitpost.com/components) — @unitpost/email on npm, builder, gallery, playground

## For AI agents

- MCP server: `https://mcp.unitpost.com/mcp` (streamable HTTP, Bearer API key) — [setup guides](https://www.unitpost.com/guides/mcp)
- [MCP server card](https://www.unitpost.com/.well-known/mcp/server-card.json) · [API catalog](https://www.unitpost.com/.well-known/api-catalog)
- [How to authenticate](https://www.unitpost.com/auth.md) — API keys, capabilities, no OAuth
- Skill for coding agents: `npx skills add unitpostcom/skills --skill unitpost`

## Migration

- [Migration Assistant](https://www.unitpost.com/migration) — move contacts, segments, topics, templates, domains, suppressions, and webhooks from Resend, SendGrid, Mailgun, Postmark, Brevo, or Loops with one read-only API key.