How do I install lettr-mcp?

Its own README gives this command: claude mcp add --transport http lettr https://app.lettr.com/mcp. Run it where your MCP client can launch the server, and check the README for any settings it asks for.

What does lettr-mcp connect to, and what does it need?

It reaches lettr. The credentials we found in its source are LETTR_API_KEY.

Which AI clients can use lettr-mcp?

Its own description mentions Cursor. That is a mention in its description, not a test we ran.

Is lettr-mcp official and is it maintained?

We found nothing naming it as a vendor’s official server. Its repository has 0 GitHub stars and its state in our directory is listed. Its last commit we recorded was on 2026-09-30.

What licence does lettr-mcp use?

The repository declares the MIT licence.

InfratoApp / Resources / MCP servers / lettr-mcp

lettr-mcp

lettr-mcp is an MCP server, listed under communication. It reaches lettr. It needs LETTR_API_KEY to authenticate. Its repository has 0 GitHub stars and is licensed under MIT; we last read it on 2026-10-22.

Official MCP server for Lettr — send emails, manage templates and domains from Claude, Cursor, and other AI agents

Install

Read from lettr-mcp’s own README, close to verbatim -- not written by us, and not guessed.

claude mcp add --transport http lettr https://app.lettr.com/mcp

View in lettr-mcp’s own README ↗

What it reaches, and what it needs

Reaches

lettr

Credential

LETTR_API_KEY

What it connects to

Supported in

Cursor

Unverified means a mention in the server’s own description, not a citation. A wrong claim here costs nothing to correct and nothing to trust yet.

Maintenance

Stars

State

listed

Licence

MIT

From the repository

Deprecated — use Lettr's hosted MCP server at app.lettr.com/mcp (OAuth or API key). Still works, no longer updated.

View on GitHub ↗2026-10-22

lettr-mcp compared with similar servers

lettr-mcp compared with the closest alternatives, by services reached, credentials, stars, last update and licence
Server	Reaches	Needs	Stars	Last update	Licence
lettr-mcp (this page)	lettr	LETTR_API_KEY	0	2026-09-30	MIT
line-bot-mcp-server	channel	CHANNEL_ACCESS_TOKEN	789	2026-10-21	Apache-2.0
graphlit-mcp-server	discord, github, google, graphlit, jira, linear, notion	DISCORD_BOT_TOKEN, GITHUB_PERSONAL_ACCESS_TOKEN, GOOGLE_EMAIL_CLIENT_SECRET, GOOGLE_EMAIL_REFRESH_TOKEN, GRAPHLIT_JWT_SECRET, JIRA_TOKEN, LINEAR_API_KEY, NOTION_API_KEY	377	2026-01-12	MIT
mcp-email-server	—	None listed	368	2026-10-25	BSD-3-Clause
telegram-mcp	telegram	None listed	349	2026-05-28	MIT
human-in-the-loop	discord	DISCORD_TOKEN	230	2025-07-02	MIT

Ranked by services in common with lettr-mcp, then by stars. Figures are from each repository when we last read it.

Common questions about lettr-mcp

What does lettr-mcp do?: Official MCP server for Lettr — send emails, manage templates and domains from Claude, Cursor, and other AI agents
How do I install lettr-mcp?: Its own README gives this command: claude mcp add --transport http lettr https://app.lettr.com/mcp. Run it where your MCP client can launch the server, and check the README for any settings it asks for.
What does lettr-mcp connect to, and what does it need?: It reaches lettr. The credentials we found in its source are LETTR_API_KEY.
Which AI clients can use lettr-mcp?: Its own description mentions Cursor. That is a mention in its description, not a test we ran.
Is lettr-mcp official and is it maintained?: We found nothing naming it as a vendor’s official server. Its repository has 0 GitHub stars and its state in our directory is listed. Its last commit we recorded was on 2026-09-30.
What licence does lettr-mcp use?: The repository declares the MIT licence.

More MCP servers for communication

All communication entries →