Can Claude Access a Shared Mailbox? Read-Only
Yes, and only to read it. Claude’s Microsoft 365 connector reaches shared and delegated mailboxes through the Mail.Read.Shared permission, covering both full access and folder-level delegation. There is no matching write or send permission for a mailbox that is not your own, so Claude can tell you what is sitting in support@ and cannot answer any of it.
Nobody sets up a team inbox to read it faster. They set one up because mail arrives in it and someone has to reply, which is the half Claude does not do.
Why Claude reads support@ but cannot answer it
Setup is genuinely easy. The connector runs on delegated permissions, so Claude acts as you and reaches whatever your Microsoft 365 account already reaches. Nothing beyond the standard admin consent is required.
The permission list is where it stops. Claude requests Mail.Read.Shared for other people’s mailboxes, then Mail.Send and Mail.ReadWrite without the .Shared suffix. Those two apply only to the signed-in mailbox. So a reply Claude writes for a thread in billing@ goes out from your personal address, which is the opposite of what a shared inbox exists to do.
Since July 2026 Claude can act inside Microsoft 365 rather than just read it, sending email, managing calendar events, and writing files to OneDrive and SharePoint, once an admin enables the write tools. Attachments are refused and sent mail is labelled as agent initiated. The catch is that writing needs a live conversation, so unattended scheduled runs stay read only. Carly is the one that acts when nobody is watching.
Claude does not act when mail arrives
Scheduled runs are the whole story in ChatGPT Scheduled Tasks and Claude Cowork. Set a time, get a result at that time. An email arriving, a booking coming in, a record changing: none of it wakes either one. Carly is built the other way round. It watches thousands of apps and starts when the event does.
This applies to every chat assistant, not to Claude alone. A shared inbox is a queue, and the work is triage on arrival: route the vendor invoice, escalate the churn language, acknowledge the enquiry inside the SLA. An assistant you have to open and prompt cannot own a queue, because the queue fills while you are not looking.
Claude, ChatGPT, Copilot and Carly on a shared mailbox
| Read a shared mailbox | Reply from that address | Attachments inside it | Starts on arrival | |
|---|---|---|---|---|
| Claude | Yes, read-only | No | Not through a write path | No |
| ChatGPT | Yes | Yes | No, blocked in shared mailboxes | No |
| Copilot Chat | Yes | Drafts, you send | Within Outlook | No |
| Carly | Yes | Yes | Yes | Yes |
Copilot Chat reached general availability in shared and delegate mailboxes between early May and early June 2026, with Summarize and Draft working without special prompt syntax, though not yet in classic Outlook for Windows. ChatGPT’s Outlook app does carry Mail.Send.Shared, so it genuinely sends from the shared address, and it cannot retrieve attachments from shared or delegated mailboxes at all. Details in Can ChatGPT access a shared mailbox?.
Run the shared mailbox with Carly instead
Carly is the only row above that answers from the shared address, and it is the only one that starts without you. A shared mailbox is authorized alongside your personal accounts, addressed by its own address, and replied to from the address that received the thread.
- Sign in at carlyassistant.com.
- Open carlyassistant.com/integrations and click Connect on Outlook.
- Authorize the account that already has access to the shared mailbox. Carly reaches it on the same delegate rights Microsoft has already granted you, so an administrator does not have to invent a new permission.
- Confirm the shared mailbox appears in Carly’s mailbox list beside your own, carrying its own address.
- Give it a role you will actually say out loud, such as Support, Billing, or AP.
Then describe the queue rather than configuring it:
Every hour during business hours, read new mail in the Support mailbox. Draft a reply from that address for anything routine, flag anything with churn language for me, and log the rest.
Replies then carry the shared address, so the customer sees support@ rather than your name, and the work runs on arrival with nothing open. Carly connects to thousands of apps, so the same run writes the escalation into your CRM, drops the invoice in accounting, and pings the owner in Slack. Free Zapier-style workflows; AI agents from $35/month. Start at carlyassistant.com.
Worked examples of exactly this: the Outlook escalation queue and vendor invoice triage, both built on a shared mailbox.
Frequently asked questions
Can Claude read a shared mailbox in Microsoft 365?
Yes. The Microsoft 365 connector covers shared and delegated mailboxes through Mail.Read.Shared, including full access and folder-level delegation, on every Claude plan.
Can Claude reply from a shared mailbox?
No. The write and send permissions it requests apply to the signed-in mailbox, so a reply goes out from your own address rather than the shared one.
Do I need an administrator to set this up?
Only the standard admin consent for the connector. Beyond that Claude uses the delegate rights already configured in Microsoft 365, so it sees a shared mailbox exactly when you do.
Can Claude watch a shared inbox and act when mail arrives?
No. It responds inside a conversation you start. Carly runs the queue on arrival and replies from the shared address.
What about a shared Gmail inbox?
Google handles this as mailbox delegation or a Groups collaborative inbox rather than as a Microsoft-style shared mailbox, and Claude’s Google connector authorizes one identity at a time. Connecting multiple Gmail accounts to Claude covers the routes.
More: Can ChatGPT access a shared mailbox? · AI for shared mailboxes · Best shared inbox tools · Can Claude send emails from Outlook? · Best AI assistants for multiple email accounts
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