Email MCP servers and APIs for AI agents, compared
There are several ways to give an AI agent access to email. This page compares Fluxmail with the MCP servers, built-in connectors, and email APIs people evaluate most. The details come from each product's public documentation.
What to look for
Hosted or self-hosted
Hosted connectors need no setup, but your mail and tokens pass through the vendor. A self-hosted server keeps credentials on your machine and needs you to run it.
Which mailboxes it reaches
Some tools only work with Gmail or only with Microsoft 365. Others create new inboxes for the agent instead of connecting the ones you already use.
Which clients can use it
A connector built into one assistant only works there. An MCP server works with any MCP client, and a REST API lets your own apps use the same mailboxes.
What the agent is allowed to do
Check whether the agent can send, schedule, or delete mail, and whether you can limit each connection to reading or drafting.
At a glance
| Product | Deployment | Providers | Interfaces |
|---|---|---|---|
| Fluxmail | Self-hosted | Gmail, Outlook, Exchange, IMAP | MCP, REST, CLI |
| Google Gmail MCP Server | Google-hosted | Gmail | MCP |
| Microsoft Work IQ MCP | Microsoft-hosted | Microsoft 365 | MCP, REST, and A2A |
| AgentMail | AgentMail-hosted | AgentMail inboxes | REST, MCP, webhooks |
| EmailEngine | Self-hosted | Gmail, Graph, IMAP | REST, webhooks |
| ChatGPT Gmail app | OpenAI-hosted | Gmail | ChatGPT app |
| Claude Gmail connector | Anthropic-hosted | Gmail | Claude connector |
| Composio Gmail | Composio-hosted | App-specific toolkits | MCP, SDK, API |
Detailed comparisons
Fluxmail vs Gmail MCP Server
A self-hosted, multi-provider email server compared with Google's remote Gmail endpoint.
- Deployment
- Google-hosted
- Providers
- Gmail
- Interfaces
- MCP
Fluxmail vs Work IQ MCP
A self-hosted, multi-provider email server compared with Microsoft's remote Microsoft 365 endpoint.
- Deployment
- Microsoft-hosted
- Providers
- Microsoft 365
- Interfaces
- MCP, REST, and A2A
Fluxmail vs AgentMail
New inboxes for each agent compared with a self-hosted API for the mailboxes you already use.
- Deployment
- AgentMail-hosted
- Providers
- AgentMail inboxes
- Interfaces
- REST, MCP, webhooks
Fluxmail vs EmailEngine
Two self-hosted email gateways: one built around agent tools, the other around REST and webhooks.
- Deployment
- Self-hosted
- Providers
- Gmail, Graph, IMAP
- Interfaces
- REST, webhooks
Fluxmail vs ChatGPT Gmail
A reusable email server for agents and apps compared with Gmail context built into ChatGPT.
- Deployment
- OpenAI-hosted
- Providers
- Gmail
- Interfaces
- ChatGPT app
Fluxmail vs Claude Gmail
A reusable self-hosted email server compared with Gmail tools built directly into Claude.
- Deployment
- Anthropic-hosted
- Providers
- Gmail
- Interfaces
- Claude connector
Fluxmail vs Composio Gmail
A focused self-hosted email server compared with a hosted platform for Gmail and many other apps.
- Deployment
- Composio-hosted
- Providers
- App-specific toolkits
- Interfaces
- MCP, SDK, API
Build on top of email
Run Fluxmail on your own infrastructure and use it through MCP, REST API, or CLI.