MailMCP vs Composio

Both connect AI agents to your inbox — but they solve different problems. Here is when each one wins, written without FUD.

Pick MailMCP if

You use ProtonMail, OVH, Infomaniak, iCloud or any non-Gmail/Outlook mailbox
You want no-code setup — paste an MCP URL in Claude/ChatGPT/Cursor and you are done
You need EU-only data processing (GDPR, French datacenters, ISO 27001 hosting)
You only need email — and you want it done right, not 250 half-baked tools

Pick Composio if

You are building an AI agent in Python or TypeScript code, not via Claude/ChatGPT settings
You need email + Slack + Notion + Jira + GitHub + 245 other tools, unified
Your mailbox is Gmail or Outlook — and US-based infra is not a problem
You have a developer team comfortable maintaining SDK upgrades

Side-by-side comparison

	MailMCP	Composio
Product type	Managed MCP email server	SDK for multi-tool AI agents
Setup	No code — paste MCP URL	Python/TS SDK in your codebase
Email providers supported	Any IMAP/SMTP (Gmail, Outlook, ProtonMail, OVH, iCloud, LWS, Infomaniak, Yahoo, custom servers…)	Gmail (OAuth), Outlook (Graph). No generic IMAP.
Number of tools	15 email-focused tools	250+ tools across 90+ apps
Works with Claude.ai, ChatGPT, Cursor, Windsurf	Yes, natively via MCP	Via custom code or MCP bridge
Works with n8n	Yes, native n8n node	Yes, via HTTP node
Data hosting	🇫🇷 France (LWS, ISO 27001)	🇺🇸 US (AWS)
GDPR-native	Yes, with signed DPA available	SCCs in place, but US-based
Email storage	Zero — direct IMAP/SMTP transit	Cached via Composio API
Free tier	1 mailbox, 20 calls/day, all features	Free dev tier with usage limits
Paid pricing	1.99 EUR/mailbox/month (annual) or 7.99 EUR/month	~$39/month and up (individual)

1. The fundamental difference: SDK vs MCP server

Composio is consumed as code. You write a Python or TypeScript agent, import the Composio SDK, declare which toolkits you need, handle OAuth flows in your app, and orchestrate everything yourself. It is a powerful platform for AI developers building bespoke agents.

MailMCP exposes its tools through MCP — the open Model Context Protocol from Anthropic. Any MCP-compatible AI (Claude Desktop, Claude.ai, ChatGPT, Cursor, Windsurf, LibreChat, plus 50+ others) discovers and uses MailMCP tools without a single line of code. Setup is paste-an-URL.

2. Provider coverage

Composio's email integrations are built per-vendor. Gmail goes through Google OAuth and the Gmail API; Outlook through Microsoft Graph. Excellent for these two — but if your business runs on ProtonMail, an OVH mailbox, an Infomaniak account, an iCloud address, or any classical mail server, Composio has no native support.

MailMCP is provider-agnostic by design. We speak IMAP and SMTP — the standards that every email server in the world supports. The same MailMCP setup works identically across Gmail, Outlook, ProtonMail (via Bridge), OVH, Infomaniak, LWS, iCloud, Yahoo, Free, Orange, and any custom IMAP host. No special integration required.

3. Data residency and compliance

Composio runs on US AWS infrastructure. They provide Standard Contractual Clauses for EU customers, which is the legal baseline post-Schrems II. Sufficient for many — insufficient for some procurement reviews.

MailMCP runs exclusively in France, on LWS-hosted servers in their ISO 27001-certified datacenters. No data leaves the EU. We provide a signed DPA on request and publish our subprocessor list. If your DPO or legal team will not approve US-based processing for email content, MailMCP is the practical choice.

4. Email-specific depth vs breadth

Composio's strength is breadth — 250+ tools across 90+ apps. Excellent for an agent that orchestrates email + Slack + GitHub + Jira + CRM in one workflow.

MailMCP's strength is depth — 15 email tools, including features no other email integration ships: scheduled sending via SMTP queue, full reply threading with In-Reply-To/References, CalDAV calendar event creation, address-book sync via CardDAV, draft mode, folder management, and real-time IMAP search. For email-centric workflows, depth wins over count.

Frequently asked questions

Is Composio open source?

Composio has open-source SDKs (Python and TypeScript) and a public core, but the managed integration platform and most of the 250+ pre-built toolkits are a hosted commercial service. MailMCP is fully managed as well — both are SaaS, not self-hosted by default.

Can Composio connect to ProtonMail, OVH, Infomaniak or any IMAP mailbox?

No. Composio's email toolkits use vendor APIs — primarily Gmail (Google OAuth) and Outlook (Microsoft Graph). For ProtonMail, OVH, Infomaniak, LWS, iCloud and other IMAP/SMTP providers, Composio has no native support. MailMCP covers every IMAP/SMTP mailbox.

Do I need to write code to use Composio?

Yes. Composio is consumed as an SDK inside your Python or TypeScript agent code. You import the SDK, authenticate, call composio.tools, etc. MailMCP is no-code: connect your mailbox in the dashboard, copy the MCP URL into Claude/ChatGPT/Cursor settings, done.

Where are my emails processed?

Composio runs on US infrastructure (AWS). MailMCP runs exclusively on French ISO 27001-certified datacenters (LWS), with no data leaving the EU. For B2B in Europe, this is a hard requirement most procurement reviews enforce.

What about pricing?

Composio has a free tier (limited calls) and paid plans starting around $39/month for individual developers. MailMCP is 1.99 EUR/mailbox/month on a 12-month commitment, or 7.99 EUR/mailbox/month without commitment — and the free plan includes 20 MCP calls/day on 1 mailbox with all features unlocked except sending.

Try MailMCP free

1 mailbox, 20 MCP calls per day, no credit card. Connect any IMAP/SMTP provider in 2 minutes.

Start for free See pricing