Krzysztof318/MailFathom

Overview

MailFathom turns IMAP mailboxes into a self-hosted, AI-native service. Mail synchronizes into your own PostgreSQL, is indexed for search and retrieval, and is served to AI agents over the Model Context Protocol. It provides semantic retrieval, answering, and gated write tools. Built with .NET 10, licensed AGPL-3.0-only.

Best for

Best for
Developers building self-hosted AI email agents on .NET

Use cases

• Build an AI agent that can search and retrieve email content via MCP
• Create a self-hosted email assistant with semantic answering
• Expose email write actions to agents with gated permissions

How to use

Tested with

Claude Code

Notes

MailFathom turns IMAP mailboxes into a self-hosted, AI-native service. Mail synchronizes into your own PostgreSQL, is indexed for search and retrieval, and is served to AI agents over the Model Context Protocol. It provides semantic retrieval, answering, and gated write tools. Built with .NET 10, licensed AGPL-3.0-only.

14 stars on GitHub. Last updated 2026-09-08. Licensed AGPL-3.0.

Use cases

• Build an AI agent that can search and retrieve email content via MCP
• Create a self-hosted email assistant with semantic answering
• Expose email write actions to agents with gated permissions

Pros

• Self-hosted, keeps email data in your own PostgreSQL
• Exposes email to AI agents via standard MCP protocol
• Includes semantic retrieval and gated write tools

Cons

• Early-stage project with only 14 stars
• AGPL-3.0-only license may restrict commercial use
• Requires .NET 10 runtime and self-hosting setup

Indexed from awesome-mcp-servers-punkpeye and enriched against its public facts.