"A tool or algorithm to convert code into a tree structure" matching MCP servers:

One-pass agentic inbox triage as an MCP server: fetch unread Gmail → classify (action_needed/fyi/newsletter/noise) → summarize → extract tasks → draft replies as Gmail DRAFTS (never sends) → flag calendar → write a triage report. Four stdio tools (fetch_emails, save_gmail_draft, append_tasks, write_report); the host is the LLM, so it runs keyless in Claude Code. Gmail scopes: readonly + compose

Enables pushing enriched leads into Instantly or Smartlead campaigns with ICP score gating, deduplication, and dry-run previews via an Apify actor.

Sends document files (EPUB, PDF, DOCX, etc.) to your Kindle via email using Amazon's Send to Kindle feature.

An MCP server that sends plain-text Gmail messages only to a predefined allowlist, using generated recipient IDs instead of email addresses to enforce security.

Enables AI assistants to interact with Microsoft 365 and Office services through the Microsoft Graph API, providing tools for email, calendar, files, Teams, SharePoint, and more with configurable permissions and output formats.

A Model Context Protocol (MCP) server that allows Claude Desktop to send documents directly to your Kindle e-reader.

Enables AI agents to send emails, create drafts in Gmail, and append content to Google Docs via standardized MCP tools.

A lightweight MCP server providing AI agents a scoped, read-and-draft-only view into Proton Mail via Proton Bridge, with code-enforced restrictions preventing external access or sending.

Enables sending documents (Markdown, PDF, EPUB) directly to a Kindle via Amazon Send-to-Kindle email, with Markdown converted to EPUB using pandoc.

MCP server that gives AI agents the ability to send, read, and search email via Gmail.

Official MCP server for Shipmail, enabling agents to manage domains, mailboxes, messages, threads, webhooks, and suppressions via natural language.

Enables monitoring shared Google storage quota and recovering Gmail space by scanning cleanup candidates, scoring them deterministically, and requiring review before moving non-protected messages to Trash.

Enables managing Gmail messages and threads via archive, label, search, trash, and other operations.

A safe, redacting MCP server for Apple Mail on macOS that enables an LLM to read, search, triage, draft, and confirm sending email while stripping secrets and blocking dangerous actions.

A security-first MCP server that provides AI agents with a scoped, read-and-draft-only view into Proton Mail via Proton Bridge, ensuring no emails can be sent and access is restricted to configured workspaces.

A brain for your mail: MailFathom turns IMAP mailboxes into a self-hosted, AI-native service.

MCP server for tidying a large Outlook / Hotmail mailbox via Microsoft Graph. Bulk moves, folder-tree surgery, inbox rules — no send tool, no permanent delete.

An MCP server that exposes a verify_email tool for checking email syntax, disposable domains, and MX records, returning a structured validity result.

MCP server that gives an agent its own email inbox: it opens the inbox, waits for the one-time code a signup sends, and reads or sends mail. Addresses are permanent, so a test suite does not need a new one per run; only the messages expire, on a retention window you set.

Enables email address verification through a single MCP tool, returning whether an address is valid, invalid, or risky.