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.
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.”
Read that carefully, because it is the whole problem. A different account replaces the current one. It does not join it. So a question that spans your personal Gmail and your employer’s Workspace has no single run that can answer it, and every switch costs you an OAuth round trip and the context of whatever you were doing.
Connector authorization is per identity, not per person. ChatGPT, Claude, and Gemini each hold one Google account at a time, so the second inbox is reachable only by replacing the first. Both OpenAI and Anthropic have open feature requests asking for several named accounts on one connector, which is a fair signal that it is not possible today.
1. Give each Gmail account a role
For example, all fictional:
| Address | Role |
|---|---|
fictional.nadia.osei@gmail.com | Personal |
fictional.nadia.osei@stripe.com | Main Company |
fictional.nadia.osei@shopify.com | Client |
Use the role in ordinary requests and the full address before anything that changes an inbox.
2. Connect every Gmail account to Carly
- Sign in at carlyassistant.com.
- Open carlyassistant.com/integrations.
- Find Gmail and click Connect.
- Choose the first Google account and approve access.
- Confirm the connected address in Carly.
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.
3. 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.
4. Test every inbox read-only first
Take one account per request to start:
In
fictional.nadia.osei@stripe.com, list the sender and subject of the five newest unread messages. Do not change anything.
In
fictional.nadia.osei@shopify.com, find the newest thread containing “renewal.” State the source account and do not draft.
Then a cross-account request, which is the one Manus could not do before:
Search the Stripe and Shopify example accounts for “invoice” from the last 30 days. Include the full source address in every row.
5. Reuse this routing prompt
Treat
fictional.nadia.osei@gmail.comas Personal,fictional.nadia.osei@stripe.comas Main Company, andfictional.nadia.osei@shopify.comas Client. Always state the target address before changing data. Ask before sends, moves, deletes, or labels.
Then name the target in each action:
Draft the reply from
fictional.nadia.osei@stripe.com. Do not send yet.
Add the Clients label in
fictional.nadia.osei@shopify.comonly.
Send the approved reply from the account that received the original thread.
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 | Add the routing prompt above 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
Ready to automate your busywork?
Carly schedules, researches, and briefs you—so you can focus on what matters.
See what people say
"Before Carly, I relied on a Calendly link, but the whole process felt impersonal and not very professional. Carly changed that by handling all the back-and-forth, so I'm no longer stuck in endless email threads trying to line up schedules.
Now Carly reaches out to candidates, shares my real-time availability, lets them pick a slot, then sends a Zoom link and drops it straight into my calendar. She sends reminders to both of us before each call, which has significantly reduced no-shows and last-minute confusion.
On top of scheduling, Carly acts like a full executive assistant, sending me my schedule the night before so I can prepare for each call. It reminds me of the old x.ai assistant, but Carly is noticeably smarter, faster, and better suited to my healthcare recruitment business."
