# letterport (letterport.dev)

Gives AI agents their own email addresses that receive mail, expose it over an API or MCP, and send threaded replies.

- Atlas card: https://inite.ai/en/atlas/letterport.dev
- Site: https://letterport.dev
- For: Developers and teams building AI agents that must read and reply to email
- Categories: agents
- Use 0/100 · alive 100/100

## Used for

- Create an inbox for an agent with one call
- Read incoming mail and reply within the same thread
- Get notified by webhook when new mail arrives

## Price

- from 19 USD/month, free plan (read 2026-10-28 on https://letterport.dev/#pricing)

## For developers

- OpenAPI: https://api.letterport.dev/openapi.json (35 paths)
- API docs: https://api.letterport.dev/docs
- MCP server: dev.letterport/letterport (namespace; auth on 2026-10-28)
- Read 2026-10-28

## MCP server, measured daily

Server: https://api.letterport.dev/mcp, checked every day since 2026-10-28 (1 checks).

- Answered: measuring, 1 daily checks so far
- Median first answer: 255 ms
- Sign-in: OAuth (the client signs the user in)
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Training on your data: no (https://letterport.dev/privacy.html)
- Read 2026-10-28

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Source: INITE Atlas, https://inite.ai/en/atlas/letterport.dev. JSON: https://inite.ai/api/atlas/letterport.dev. MCP: https://inite.ai/api/mcp (atlas_lookup).