Connect Inkbox to Claude and ChatGPT
Inkbox inboxes connect to Claude and ChatGPT through Multi Mail, each with an API key scoped to that inbox.
For inkboxmail.com addresses.
The AI apps' own connectors
- Inkbox, Inkbox's own connector in Claude's directory, lets an AI assistant read and send from its own inbox, keep its threads organised and handle its text and iMessage conversations. Read on 3 November 2026.
Connect it
At InkboxThe link opens Inkbox in a new tab.
- 1
Sign in to the Inkbox Console at inkbox.ai, open API keys and choose New API key.
- 2
Name it Lumman, and under Scope choose this inbox's identity - an Admin (all) key does not open a mailbox.
- 3
Choose Create API key and copy the key.
Inkbox shows it once - leave that page open until Lumman asks for it.
Add it to
- 4Add to ClaudeOpens claude.ai - press Connect there.
- 5
Sign in, add your Inkbox inbox and approve Claude in the window Claude opens - choose Another mailbox, type the address and paste the API key when it asks
- 6
Ask Claude about your mail
- 4
Run in Claude Code
/plugin marketplace add lumman-lab/multi-mail/plugin install multi-mail@multi-mailRun the first, then the second.
- 5
Sign in, add your Inkbox inbox and approve Claude Code on the Lumman page your browser opens - choose Another mailbox, type the address and paste the API key when it asks. If none opens, run /mcp and choose multi-mail.
- 6
Ask, or run
/multi-mail:triage
Works fully on ChatGPT Business, Enterprise and Edu.
- 4
Copy the address
- 5Open 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.
- 6
Install it, then sign in, add your Inkbox inbox and approve on the Lumman page it opens - choose Another mailbox, type the address and paste the API key when it asks. In a chat, type @ and choose Multi Mail.
- 4
Add to
~/.cursor/mcp.json - 5
Sign in, add your Inkbox inbox and approve Cursor on the Lumman page Cursor opens - choose Another mailbox, type the address and paste the API key when it asks
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, 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 and bin its mail, and clean up its inbox by sender, putting back what a clean-up moved.
- Multi Mail reaches no filters or vacation responder at Inkbox.
- Inkbox keeps its own six folders - inbox, archive, sent mail, drafts, spam and bin - and makes no label of yours.
- Each API key opens one inbox. Connect another inbox with its own key.
If it refuses
- Inkbox refused this key. Use an API key scoped to this inbox's identity, not an Admin (all) key, and check the address.
- We could not reach Inkbox's mail server. Try again.
Connection
- Receiving
- imap.inkboxmail.com, port 993
- Sending
- smtp.inkboxmail.com, port 587
- Login
- Your whole address and the API key
- Check
- Both servers accept the password before the mailbox is added
Your data
- Stored
- The API key, encrypted under a key held outside the database
- No copy kept - read from the mailbox on each call
- Removing it
- Disconnecting deletes our copy of the API key, which works until you revoke it in the Inkbox Console under API keys.
Tools
- Offered
- 29 of the 35 - no settings_filters_list, settings_filters_create, settings_filters_update, settings_filters_delete, settings_get_vacation or settings_update_vacation
Everything else
Multi Mail's address, sign-in, limits and every tool: Multi Mail's technical details.