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WarmInboxes in Google Gemini

Ask Gemini whether a domain is ready to send from, what a bounce means, or how many inboxes a volume needs, and WarmInboxes runs the check. Free, read-only, and no sign-in.

WarmInboxes applied to Google’s Connected Apps program on 10 November 2026; it is not listed yet. The program is in preview. Until it is listed in Gemini, the same free tools run in ChatGPT, Claude and Cursor.

What it does

  • Check a sending domain: SPF, DKIM, DMARC, MX, blocklists and domain age, with an A-F grade.
  • Read bounce messages and email headers and say what they mean.
  • Check cold email copy for spam triggers before it is sent.
  • Plan how many inboxes and domains a daily volume needs, and how to rotate them.
  • Explain how to connect a WarmInboxes account when you are ready to order or manage inboxes.

It reports what each check returned and names the tool that ran it. A check that could not run is reported as not run, never as a pass. It does not query the Spamhaus DBL, does not give reputation scores (mailbox providers keep those private), and cannot send email, change DNS or touch anyone’s inboxes.

Try it

Type @WarmInboxes in Gemini, or name it in your request:

  • WarmInboxes, is acme.com set up correctly to send cold email?
  • WarmInboxes, why are these emails bouncing? [paste the bounces]
  • How many inboxes do I need for 3,000 cold emails a day? Ask WarmInboxes.
  • WarmInboxes, how do I connect my WarmInboxes account?

Your data, disconnecting and deleting

WarmInboxes in Gemini has no sign-in. We receive no Google account details, name or email address, and the app cannot see or change a WarmInboxes account.

  • What Gemini sends for a check (a domain, pasted headers, bounces or copy) is processed in memory to produce the answer and returned. It is not stored and its contents are not logged.
  • A daily limit counts the distinct domains checked against the IP address the request comes from. Those records are deleted within two days.
  • Each tool call records an anonymous usage event (which tool, the kind of client, a coarse outcome) with no domain, nothing you pasted and no identifier, deleted after 90 days.
  • When it sizes a fleet, the plan is saved at its own link for 30 days, holding counts and prices only, so you can open it again.

To disconnect: in Gemini, open Settings & help, then Connected apps, and disconnect WarmInboxes. Nothing is stored against you, so there is nothing to delete; if you want us to confirm that or have a question, contact us through the privacy policy, which covers this app in its free tools section.

When you’re ready for your own account

WarmInboxes in Gemini runs the free, read-only tools: domain checks, bounce and header reading, copy checks and fleet planning. It has no sign-in, so it cannot see or change a WarmInboxes account, place an order or touch anyone's inboxes. Everything below happens outside this chat, in the WarmInboxes app or in a client that can hold an API key.

Order inboxes for the first time

  1. Open the WarmInboxes app at https://app.warminboxes.com and create an account.
  2. If a planning result here gave you a saved plan link, open it: its order link carries the plan into the app, so the counts are filled in.
  3. Place the order in the app. You pay on a payment page you open yourself; nothing is charged from a chat.
  4. Inboxes are delivered within 48 to 72 hours of payment. Prewarmed ones send on delivery; fresh ones warm for 14 to 21 days first.

Check or change an account you already have

  1. Sign in at https://app.warminboxes.com.
  2. The dashboard shows every order, its domains and its build state. A domain marked waiting on you needs its nameservers pointed where the app shows.
  3. Domain forwarding, client workspaces, inbox names and exports into Instantly, Smartlead, PlusVibe or Email Bison are all in the app.
  4. Cancellation is by domain: a domain is cancelled with all of its inboxes.

Let an AI assistant work your account

  1. Use a client that can send an API key with each request: Claude Code, Cursor, Claude Desktop or VS Code, or the wib command line. Gemini cannot hold a WarmInboxes key yet.
  2. In the app, open Settings, then API keys (account owner only). Pick only the scopes you need: read for reporting, write for exports and changes, orders:place only if the assistant should place orders.
  3. Turn on Test key first. A test key runs every tool against a sandbox copy of your account: nothing is charged, built or changed.
  4. Add WarmInboxes Infrastructure MCP (https://api.warminboxes.com/mcp) to your client with the key as a bearer token, in your own terminal or config file. In Claude Code: claude mcp add --transport http warminboxes-infrastructure https://api.warminboxes.com/mcp --header "Authorization: Bearer wib_your_key_here"
  5. Before any order, the assistant previews it and shows you the price; it places the order only on your yes.

Try ordering without spending anything

  1. Make a test key in the app (Settings, then API keys, with Test key on).
  2. Connect it as above. Every answer comes from a sandbox with five example orders and a test card; time moves, so a test order builds in minutes.
  3. Swap in a live key when the flow works.

Keeping your account safe

  • Never paste an API key, a sequencer password or a registrar password into a chat. Keys go in your terminal, your client's config or the app.
  • If a key ever ends up in a chat, revoke it in the app (Settings, then API keys) and make a new one. Revoking takes effect on the next request.
  • Anything that charges a card is previewed and shown to you first.

The full reference for WarmInboxes Infrastructure MCP and the API is at docs.warminboxes.com, and the setup guide at Developers.

For developers

The Gemini app is a Streamable HTTP MCP server at https://warminboxes.com/mcp/google/v1, no authentication: fifteen read-only tools from the free WarmInboxes tools, plus the account guide. Every free tool is on the full server at WarmInboxes Free MCP.

Prewarmed & Fresh Inboxes

Google, Microsoft 365 and Azure inboxes with free prewarmed domains and DNS configured before you log in. Prewarmed inboxes send the day they land; every order is delivered within 48 to 72 hours.

Get Prewarmed & Fresh Inboxes