MCP servers based on Microsoft Graph only reach mailboxes in Exchange Online (the Microsoft cloud). An Exchange Server on-premises is not connected this way.

Multi-user MCP server for Exchange on-premises and hybrid - either managed by us or self-hosted as a license. OAuth 2.0/PKCE, per-user vault, central administration - set up once, for all employees.

What is an MCP server for Microsoft Exchange?

A server that makes Exchange mailboxes accessible to AI assistants via the Model Context Protocol (MCP): emails, calendar, contacts and tasks as standardized tools that Claude, ChatGPT, Mistral Vibe or your own agents can call - with the permissions of the respective user.

Does the MCP server work with Exchange on-premises?

Yes - that is the core: connection via EWS for Microsoft Exchange Server SE, 2019 and 2016, including hybrid environments. Either managed by us or self-hosted as a license - in both cases with no installation on clients.

Can I use the MCP server in Copilot Studio or n8n?

Microsoft Copilot Studio: yes. Postgate AI is added there as an MCP tool (Streamable HTTP, OAuth 2.0 with dynamic discovery) - your Copilot agent accesses on-premises mailboxes, each user with their own Exchange permissions. More platforms like n8n are in preparation - talk to us.

Clients via OAuth 2.0 with PKCE; the user’s Exchange credentials are stored encrypted in the per-user vault. Every access is delegated, using the existing Exchange permissions of the respective user.

How is Postgate AI different from open-source MCP servers for EWS?

Open-source servers usually run as a stdio process for a single mailbox, with credentials in environment variables and self-managed operation. Postgate AI is a multi-user MCP server with OAuth 2.0/PKCE, an RSA-4096 vault per user, delegated permissions and central administration in the portal - either managed by us or as a self-hosted license.

Exchange as an MCP server - testable in minutes.

7 days free in the managed variant - connect your EWS URL, pair a client, use the tools. Self-hosted license on request.

Agent-native forum for the x402/A2A ecosystem. The hosted MCP server exposes the whole forum as tools — threads, comments, votes, USDC bounties (Coinbase x402 on Base), provider reviews, and search. Endpoint: https://api.achivx.com/mcp/ (HTTP, OAuth 2.1).

Voice MCP server: voice-cloning TTS/STT with speak, talk, voice inbox and feeds - remote MCP with OAuth at mcp.koe.live

Hosted, read-only Twitter/X data for AI agents via OAuth—search tweets, profiles, followers, lists, communities, and spaces, with 100 free requests for new accounts.

The 1Password MCP server creates a bridge that allows MCP clients such as Codex and Kiro to manage your 1Password Environments with secure authorization prompts.

Browser automation framework with savable auth profiles and compliance options viable to enterprise developments.

Agent identity and key custody — provider keys held in a local encrypted vault and leased to agents under owner approvals, with env-var injection so secrets never enter model context and a one-command kill switch; plus a registry with Ed25519 agent identity, reputation, and messaging.

Drive a personal UK Tesco grocery account: search, basket, delivery slots, orders, and on-pack nutrition. Filter and rank products by macros + micros. Catalogue and nutrition tools need no auth.

Hosted notes MCP server: full-text and semantic search, tags, folders, note CRUD, and spaced-repetition review over your notes, bookmarks, and feeds (OAuth 2.1, remote endpoint https://mcp.dexi.net/mcp).

A server for comprehensive Google Sheets integration, requiring Google OAuth credentials.