How to Connect Multiple Gmail Accounts to Manus
A single Manus task can work across every Gmail account you own once Carly is holding them. Authorize each Google identity in Carly, add one custom MCP connector in Manus, and the agent addresses whichever inbox you name. The same Carly account holds your Outlook mailboxes and every calendar on both sides, so you set this up once for all of it.
1. Add your Gmail accounts to Carly
- Sign in at carlyassistant.com.
- Open carlyassistant.com/integrations.
- Find Gmail, click Connect, and authorize the account.
- Click Connect again for the next one, and keep going for as many accounts as you want.
Repeat for each additional identity, choosing Use another account if Google preselects the first login. Verify the full address after every authorization before adding the next.
If a Google Workspace account requires administrator review, ask that Workspace administrator to approve the connection, then finish authorization. Each Workspace approves independently.
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 Manus to reach through the same connector.
2. Add Carly to Manus as a custom MCP server
This is the step people skip, and skipping it leaves you with connected inboxes that Manus cannot see. Manus accepts custom Model Context Protocol servers alongside its prebuilt connectors, which is how Carly gets in.
Open Manus settings and look for the custom MCP entry point in the connectors area. Manus has shipped this under more than one set of labels, so expect either Settings → Connectors → + Add Connectors → Custom MCP or Settings → Integrations → Custom MCP Servers, depending on your build. Whichever you see, the server details are the same:
- Name:
Carly - Server URL:
https://carlyassistant.com/mcp/
Carly’s server is a hosted HTTPS endpoint that authorizes over OAuth, so there is no key to paste and nothing to deploy. Complete the sign-in to the Carly workspace holding your Gmail accounts, then let Manus test the connection and pull in the tool list. Carly’s mail, calendar, and workflow tools should appear alongside your other integrations.
What one task can do afterwards
- Search a personal address and two work addresses in the same run.
- Pull the quote, the contract, and the invoice from three different inboxes into one document.
- Build a morning briefing grouped by account.
- Draft or send from the exact address you name.
- Label, archive, or move mail in the correct inbox.
- Read several calendars while writing to only one.
Nothing is merged and nothing is forwarded. Each Google identity keeps its own authorization, and Carly keeps every account separately addressable.
Why Manus’s own Gmail connector is a switch, not a stack
Manus ships a Gmail connector, and it is good at what it advertises: scanning an inbox, summarizing it, surfacing what is urgent, and searching mail in plain language. The account model is the constraint. Manus documents changing accounts as a re-authentication: you open the connector, choose Manage, then Configure, and that flow lets you “select a different account or workspace for the connector.”
The part that outlives the task
A Manus run is a task with a beginning and an end. Most inbox work is not shaped like that. Triage every morning, the follow-up nobody answered, the receipt that has to reach the bookkeeper, the client who always asks the same question: those recur, and starting each one by hand is the actual cost.
That work belongs in a Carly workflow or a Carly agent, which runs with nothing open. Carly watches each connected mailbox as its own trigger source, so a rule can fire on mail arriving in the client account and stay quiet on the personal one. Manus then becomes the place you send genuinely open-ended, one-off work, with the recurring half already handled underneath it.
Switching accounts versus holding them
| Need | Manus Gmail connector | Carly through custom MCP |
|---|---|---|
| Read and summarize one inbox | Yes | Yes |
| Hold several Gmail accounts at once | Reconnect to change account | Yes, all at once |
| Answer a question spanning two inboxes | Not in one run | Yes |
| Address a specific account in a prompt | No shared convention | Yes, by email address |
| Add a fourth account later | Another authorization to juggle | No config change |
| Keep the work running between tasks | No | Yes |
Carly gives Manus one account-aware mail toolset instead of a connector you keep re-pointing. Carly offers free Zapier-style workflows; AI agents start at $35/month.
Quick fixes when an inbox does not appear
| Problem | Fix |
|---|---|
| Carly’s tools are missing in Manus | Re-run the connection test so Manus refetches the tool list |
| The connector will not authorize | Finish the OAuth sign-in in the browser tab Manus opens |
| Google connected the same Gmail twice | Remove the duplicate in Carly and reconnect with Use another account |
| A Workspace blocks authorization | Ask that Workspace administrator to approve Carly |
| Manus queries the wrong inbox | Use the full address and require source attribution |
| A send went from the wrong account | Name the full account in the instruction and keep approvals on |
Frequently asked questions
Can Manus connect two Gmail accounts at once?
Its own Gmail connector holds one at a time. Manus documents switching as a re-authentication through Manage → Configure, which selects a different account rather than adding one. Adding Carly as a custom MCP server at https://carlyassistant.com/mcp/ is how one task reaches every inbox.
How many Gmail accounts can this reach?
As many as you authorize in Carly. Manus connects to one server, so the account count is a Carly setting rather than a Manus one.
Does this work for Google Workspace as well as personal Gmail?
Yes. Both are Google identities and each is authorized separately in Carly. A managed Workspace may need its administrator to approve the connection first.
Do I still need the Manus Gmail connector?
No. Once Carly is connected, mail reaches Manus through Carly, and you avoid the re-authorization step every time you change accounts.
Related: Multiple Gmail accounts in Codex · Multiple Gmail accounts in Claude Code · Best AI assistants for multiple Gmail accounts · Manus alternatives · What is MCP · Gmail MCP
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