Connect AT&T Mail to Claude and ChatGPT
Multi Mail connects AT&T mailboxes to Claude and ChatGPT with a secure mail key, never your AT&T password.
For att.net, sbcglobal.net, bellsouth.net, ameritech.net, currently.com, flash.net, nvbell.net, pacbell.net, prodigy.net, snet.net, swbell.net and wans.net addresses, and other domains whose mail AT&T Mail's own servers receive.
The AI apps' own connectors
Multi Mail's other provider pages name what the AI apps' own connectors do for their providers: Gmail, Outlook and Hotmail, Microsoft 365, iCloud, Fastmail, Inkbox.
Connect it
At AT&TThe link opens AT&T in a new tab.
- 1
Sign in to your AT&T account profile at www.att.com.
- 2
Choose Settings and confirm the account is this address's - select Switch if it is another.
- 3
Select Add secure mail key, enter Lumman as its nickname, select Create and copy the key.
AT&T 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 AT&T mailbox and approve Claude in the window Claude opens - choose Another mailbox, type the address and paste the secure mail 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 AT&T mailbox and approve Claude Code on the Lumman page your browser opens - choose Another mailbox, type the address and paste the secure mail 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 AT&T mailbox and approve on the Lumman page it opens - choose Another mailbox, type the address and paste the secure mail key when it asks. In a chat, type @ and choose Multi Mail.
- 4
Add to
~/.cursor/mcp.json - 5
Sign in, add your AT&T mailbox and approve Cursor on the Lumman page Cursor opens - choose Another mailbox, type the address and paste the secure mail 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, bin and file 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 AT&T.
- AT&T's default view shows a mail app only each folder's newest messages. Multi Mail reads that view, and says which folder holds more.
If it refuses
- AT&T refused this key. Use a secure mail key made for this address, not the password you sign in to AT&T Mail with, and check the address.
- We could not reach AT&T's mail server. Try again.
Connection
- Receiving
- imap.mail.att.net, port 993
- Sending
- smtp.mail.att.net, port 587
- Login
- Your whole address and the secure mail key
- Check
- Both servers accept the password before the mailbox is added
Your data
- Stored
- The secure mail 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 secure mail key. AT&T's secure mail keys never expire.
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.