Best mailbox.org MCP Servers
Mailbox.org is a secure email service from Germany that offers encrypted communications and online office solutions with a focus on privacy and data protection.
Why this server?
Allows managing mailbox.org email accounts via IMAP, enabling operations such as searching, reading, sending, moving, and deleting emails, as well as folder management.
AlicenseAqualityAmaintenanceEnables Claude to interact with email accounts via IMAP and SMTP, providing tools for searching, reading, sending, and managing emails across multiple providers.40800 npm111MITWhy this server?
Allows connecting to mailbox.org email accounts via IMAP to archive, encrypt, and search emails.
AlicenseAqualityBmaintenanceZero-trust encrypted email archiving and search MCP server with real-time IMAP IDLE ingestion, AES-256-GCM encryption, SQLite FTS5 full-text search, and Obsidian vault export, exposing tools for AI assistants to search, retrieve, and manage emails.72MITWhy this server?
Allows managing mailbox.org calendars over CalDAV, including listing calendars and events, searching events, checking free/busy availability, creating and updating events, and responding to invitations.
AlicenseAqualityAmaintenanceEnables MCP clients to interact with CalDAV calendars, letting users view schedules, find free time, create and update events, manage tasks and dated notes, and respond to invitations on their own server.22127 npmMITWhy this server?
Supports reading and writing contacts in a mailbox.org CardDAV address book, including listing, searching, creating, updating, and managing groups and contact photos.
AlicenseAqualityAmaintenanceRead and write CardDAV address books: contacts, groups and photos over the open standard1722 npmMITWhy this server?
Enables access to mailbox.org accounts via IMAP/SMTP for reading, searching, drafting, and sending emails when allowed.
AlicenseAqualityAmaintenanceLets Claude Desktop read any IMAP mailbox and send emails via SMTP, with support for multiple mailboxes and locally stored credentials.1321 npmMITWhy this server?
Provides full CRUD operations on calendar events, free/busy, and availability-finding for mailbox.org calendars.
AlicenseAqualityDmaintenanceEnables full CRUD operations on calendar events, free/busy queries, and availability slot finding via CalDAV, supporting Nextcloud, Radicale, iCloud, and other RFC 4791-compliant servers.8MITWhy this server?
Provides email management for mailbox.org accounts, including searching, reading, drafting, and optionally sending and organizing messages.
AlicenseAqualityAmaintenanceEmail MCP server for any IMAP mailbox, Outlook and Microsoft 365 included through browser sign-in. Search, read and draft with every message fenced as untrusted input, warnings for hidden text, lookalike letters and injected instructions, and sending locked to an allowlist.6358 npm4MITWhy this server?
Allows reading, writing, validating, activating, and backing up Sieve mail filter scripts on mailbox.org over ManageSieve.

sieve-mcp-serverofficial
AlicenseNot gradedqualityCmaintenanceEnables Claude and other MCP clients to read, write, validate, activate, and manage server-side mail filtering rules over ManageSieve. It provides safe updates with validation, dry-run diffs, backups, and shared encrypted account configuration.MITWhy this server?
Enables IMAP email integration with mailbox.org accounts, providing tools to search, read, move, mark, delete, and send emails, as well as manage folders and check unread counts via pre-configured settings.
AlicenseNot gradedqualityAmaintenanceEnables AI assistants to connect to multiple IMAP and SMTP mailboxes for searching, reading, sending, replying, forwarding, organizing, and bulk-deleting email. Credentials are stored with AES-256 encryption, with connection pooling, folder management, and a web setup wizard covering 15+ providers.800 npmMIT