Connect Multiple Email Accounts to ChatGPT
ChatGPT’s own apps hold one Gmail and one Outlook at a time, and never two of either, but you can still work across every mailbox you own. Connect each account to Carly, add Carly to ChatGPT once, and a single chat can search or act in whichever inbox you name, Google or Microsoft.
1. Add your Gmail and Outlook mailboxes to Carly
- Sign in at carlyassistant.com.
- Open carlyassistant.com/integrations.
- Find Gmail and Outlook, click Connect, and authorize the mailbox.
- Click Connect again for the next one, and keep going for as many mailboxes as you want.
A Google Workspace or Microsoft 365 account may need administrator review. Ask the administrator to approve, then finish authorization.
Mix providers freely here. This is the step ChatGPT’s own apps cannot do: a second Gmail sits beside the first, and Outlook sits beside both.
Carly connects to thousands of apps, so while you are on that page you can add your calendars, files, CRM, and anything else you want ChatGPT to reach through the same connector.
2. Add Carly to ChatGPT
- Open Plugins in the ChatGPT sidebar.
- Click +.
- Paste
https://carlyassistant.com/mcp/. - Continue to authorization.
- Sign in to the Carly account holding your mailboxes.
- Make Carly available to the chat.
Since July 9, 2026 apps ship inside "plugins," listed in one directory spanning ChatGPT and Codex. Existing connections kept working and nothing needed resubmitting. What changed is the packaging and the storefront, not the protocol.
If + is greyed out on a Business or Enterprise workspace, the ChatGPT administrator may need to enable the plugin first.
What one chat can do afterwards
- Search a personal Gmail and a work Outlook in the same question.
- Compare a thread in one company’s mailbox against another’s.
- Produce a morning briefing grouped by inbox.
- Draft or send from the exact address you choose.
- Label, move, flag or archive in the correct account.
- Check several calendars for conflicts while writing to only one.
- Read and reply in a team inbox such as
billing@alongside your own.
Why account switching does not solve this
Since August 2026 ChatGPT and Codex hold several Google accounts at once for Gmail, Calendar and Contacts, and you pick which one a request should use. That is where it stops. Google Drive was left out, and every non-Google connector still authorizes one account each, so a second Outlook mailbox or Slack workspace replaces the first. Carly carries all of them.
ChatGPT’s own apps versus Carly
| ChatGPT’s Gmail and Outlook apps | Carly | |
|---|---|---|
| Gmail accounts at once | One | Every one you connect |
| Outlook accounts at once | One | Every one you connect |
| Gmail and Outlook together | Yes, one of each | Yes, any number of each |
| Says which account it used | Not consistently | On every action |
| Sends with attachments | No | Yes |
| Starts when mail arrives | No | Yes |
ChatGPT drafts and sends from a connected Gmail or Outlook account, with you confirming each send. Claude sends too: its Gmail connector drafts, sends, replies and forwards, and its Microsoft 365 connector does the same once an admin enables the write tools, though that one rejects anything with an attachment. Both need you in the conversation. Carly sends the reply while you are away, attachments included.
Carly’s agents also carry their own name, email address and memory, so a colleague or client can write to one directly and the work begins on arrival rather than when you next open a chat. Around the mail, Carly connects to thousands of apps. Free Zapier-style workflows; AI agents from $35/month.
Connect every inbox at carlyassistant.com.
Quick fixes when a mailbox does not appear
- The provider reused your signed-in account. Choose Use another account on the provider’s screen rather than the suggested profile.
- A work account stalls at consent. A Google Workspace or Microsoft 365 administrator has to approve before authorization completes.
- ChatGPT does not see Carly. Reopen Plugins and confirm Carly is enabled for the current chat.
- The wrong inbox answered. Name the address in the prompt.
Frequently asked questions
What about a shared mailbox like billing@?
Carly connects a shared mailbox as its own mailbox, listed beside your personal accounts with its own shared flag, so you name it in a prompt like any other address. ChatGPT’s native app can read one the signed-in identity already reaches, though attachments in it do not come back. See Can ChatGPT access a shared mailbox?.
Can ChatGPT connect to multiple email accounts?
Its own apps hold one Gmail and one Outlook at a time. Connecting every mailbox to Carly and adding Carly to ChatGPT once lets a single chat reach all of them.
Can ChatGPT connect two Gmail accounts?
Not through its own connector, which authorizes a single Google identity and replaces it when you sign in with a second. Carly holds both at once.
Does switching ChatGPT accounts give me both inboxes?
No. Connected apps are scoped per login, so each account keeps its own connections and no single chat reaches across them.
Will it tell me which account it used?
Through Carly, yes. Every action reports the source address, which is what makes cross-account work safe to trust.
Can it send from the right address?
Yes, and with attachments, from whichever connected mailbox you name.
More: How to connect multiple Gmail accounts to ChatGPT · How to connect multiple Outlook accounts to ChatGPT · Connect multiple email accounts to ChatGPT Work · How to add another account to ChatGPT · Best AI assistants for multiple email accounts
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