Connect Outlook.com and Hotmail to Claude and ChatGPT
Multi Mail connects Outlook.com and Hotmail mailboxes to Claude and ChatGPT with Microsoft sign-in, so Lumman never receives your password.
For Outlook.com and Hotmail addresses. A work or school address is on Microsoft 365.
The AI apps' own connectors
- Microsoft 365, Anthropic's connector in Claude's directory, connects a personal outlook.com, hotmail.com or live.com account on Claude's Free, Pro, Max and Ultra plans, and Anthropic's help article says it searches its Outlook email, drafts and sends mail, manages its categories and moves mail to Deleted Items. Read on 9 November 2026.
Connect it
Add it to
- 1Add to ClaudeOpens claude.ai - press Connect there.
- 2
Choose Outlook or Microsoft 365, then sign in at Microsoft in the window Claude opens. That adds your mailbox and approves Claude in one step.
- 3
Ask Claude about your mail
- 1
Run in Claude Code
/plugin marketplace add lumman-lab/multi-mail/plugin install multi-mail@multi-mailRun the first, then the second.
- 2
Choose Outlook or Microsoft 365, then sign in at Microsoft on the Lumman page your browser opens. That adds your mailbox and approves Claude Code in one step. If none opens, run /mcp and choose multi-mail.
- 3
Ask, or run
/multi-mail:triage
Works fully on ChatGPT Business, Enterprise and Edu.
- 1
Copy the address
- 2Open ChatGPT plugins
Press +, choose Add custom MCP server, name it Multi Mail, paste the address, choose OAuth, tick the box and press Create as a plugin.
- 3
Install it, then choose Outlook or Microsoft 365, then sign in at Microsoft on the Lumman page it opens. That adds your mailbox and approves ChatGPT in one step. In a chat, type @ and choose Multi Mail.
- 1
Add to
~/.cursor/mcp.json - 2
Choose Outlook or Microsoft 365, then sign in at Microsoft on the Lumman page Cursor opens. That adds your mailbox and approves Cursor in one step.
Streamable HTTP, OAuth 2.1 with dynamic client registration. No key or client id.
- VS Code
Run MCP: Add Server, choose HTTP, paste the address and name it multi-mail.
- Gemini CLI
gemini extensions install https://github.com/lumman-lab/multi-mailIts first call opens Lumman's sign-in; /mcp auth multi-mail opens it again.
- Antigravity
agy plugin install https://github.com/lumman-lab/multi-mailRun /mcp, open multi-mail_multi-mail and choose Authenticate; approve on the Lumman page, then paste the code Antigravity shows back into it.
Any number of mailboxes. 25 actions a day free, up to 250 a month, 1,000 a day on Standard for $50 a year or $5 a month, or 10,000 a day on Plus for $200 a year or $20 a month.
Reach and limits
- Search and read it together with every other mailbox you add.
- Draft, reply, forward and send from it.
- Archive, bin and file its mail, and clean up its inbox by sender, putting back what a clean-up moved.
- Set its inbox rules and automatic replies.
- Find what fills a full mailbox - the largest senders and messages - and clear it, saying when the space comes back.
If it refuses
- Microsoft was declined, so nothing was connected. Connect the mailbox again and accept when Microsoft asks.
- That Microsoft account holds no Outlook or Exchange Online mailbox, so nothing was connected.
Connection
- Reached through
- Microsoft Graph
- Permissions
- Mail.ReadWrite, Mail.Send, MailboxSettings.ReadWrite, User.Read, offline_access - delegated
Your data
- Stored
- Microsoft's credential, encrypted under a key held outside the database
- No copy kept - read from the mailbox on each call
- Removing it
- Disconnecting deletes our credential. To remove Lumman at Microsoft too, go to account.live.com/consent/Manage.
Tools
- Offered
- All 35
Everything else
Multi Mail's address, sign-in, limits and every tool: Multi Mail's technical details.