How to Connect Multiple Gmail Accounts to Gemini Spark
Gemini Spark reads the Gmail belonging to the Google account you signed in with. Connect every inbox to Carly, wire Carly into Spark as a custom MCP connector, and one Spark session can search or act across all of them. 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.
Then repeat for each additional Google identity. Choose Use another account if Google preselects the first login, and 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 and 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 Gemini Spark to reach through the same connector.
2. Add Carly to Spark over MCP
- Open Spark’s settings and find connected apps.
- Choose the option to add a custom MCP connector.
- Paste
https://carlyassistant.com/mcp/. - Complete authorization.
- Sign in to the Carly workspace holding the Gmail accounts.
Custom app support has rolled out unevenly across Spark’s surfaces and tiers, so if the option is missing, confirm your plan and platform against Google’s availability documentation rather than assuming the connector is at fault.
What one Spark session can do afterwards
- Search personal and work Gmail in the same request.
- Compare threads sitting in different company accounts.
- Produce a morning brief grouped by inbox.
- Draft or send from the exact address you choose.
- Label, move, or archive in the correct account.
- Check several calendars while writing to only one.
Nothing is merged. Each inbox keeps its own credentials and stays individually addressable.
Spark’s native reach is one Google identity
Google describes Spark as connecting “natively with your favorite Google apps like Gmail, Calendar, Drive, Docs, Sheets, Slides, YouTube, and Google Maps.” That native reach follows the signed-in account, which is the same shape as the Gemini app: switching inboxes means switching accounts, and a request spanning both cannot run in one session.
Spark’s June 2026 update added connected apps (Google Tasks, Google Keep, Canva, Dropbox, Instacart, OpenTable, Zillow Rentals) and, more usefully here, support for “custom Model Context Protocol (MCP), giving you the ability to connect your favorite apps directly into Spark.”
Native Gmail in Spark versus Carly
| Need | Native Spark connection | Carly over MCP |
|---|---|---|
| Search the signed-in Google account | Yes | Yes |
| Hold several Google identities at once | No | Yes |
| Compare two inboxes in one session | No | Yes |
| Draft and send from a chosen address | Limited to the signed-in identity | Yes |
| Reach a non-Google mailbox | No | Yes |
| Run the same routing outside Spark | No | Yes |
| Available without a paid Google AI tier | No, Pro or Ultra required | Yes |
| Works on a work or school Google account | No, personal accounts only | Yes |
Carly gives Spark one account-aware toolset over several Gmail connections, and the same routing keeps working outside Spark’s availability gates. Carly offers free Zapier-style workflows; AI agents start at $35/month.
Quick fixes when an inbox does not appear
| Problem | Fix |
|---|---|
| Custom MCP option is missing in Spark | Confirm your tier and platform against Google’s availability docs |
| Google connected the same Gmail twice | Remove the duplicate and reconnect with Use another account |
| A Workspace blocks authorization | Ask that Workspace administrator to approve Carly |
| Spark searches only the signed-in inbox | Name the full address and require source attribution |
| Spark cannot act while you are away | Put the recurring work in a Carly workflow |
Frequently asked questions
Can Gemini Spark hold two Gmail accounts natively?
Spark’s native Google reach follows the account you sign in with. Carly is the way to make several separately authorized Gmail accounts available in one session.
Do I need Google AI Ultra for this?
Not Ultra specifically. Google’s help centre says Spark needs a Google AI Pro or Ultra subscription, a personal Google Account rather than a work or school one, and a location outside the European Economic Area, Nigeria, Switzerland and the United Kingdom. Carly’s multi-account routing does not depend on any of that, so the same setup works in other assistants too.
Does this merge the inboxes?
No. They stay separate. Spark can search across them while Carly routes each draft, label, send, or move to the address you name.
Related: What is Gemini Spark · Multiple Gmail accounts in Gemini · Gemini Spark alternatives · Manage multiple email accounts with AI · Carly’s Gmail integration
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