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InboxKit sells sending domains and dedicated cold-email mailboxes, and Oneprofile connects to it directly. Buy mailboxes there, then import them here without ever seeing a Google consent screen.
The InboxKit tab of the Settings Connections page, beside the Integrations and MCP servers tabs, with an InboxKit API key field and a Continue button under it.

The InboxKit tab under Connections, before a key is connected.

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Import mailboxes from InboxKit

1

Open the import dialog

On the Mailboxes tab, click Import from InboxKit.
2

Connect InboxKit

First time only: paste your InboxKit API key and click Continue. Confirm the workspace the key belongs to, then click Connect.
3

Pick from your inventory

Search or scroll InboxKit’s live inventory and tick the mailboxes you want. A domain still authorizing finishes on its own and imports its mailboxes once ready.
4

Set a limit and import

Leave Daily send limit blank to use the default, then click Import. The button counts your selection before you click it.
Imported mailboxes arrive unassigned, so nothing sends from them yet. Open the sender that should use them and click Add from this workspace on its Mailboxes tab, as described on Senders.

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Manage the connection

The InboxKit tab under Connections holds everything about the standing connection, reached from Manage in Settings in the import dialog. Two automation toggles, Add new mailboxes automatically and Disconnect removed mailboxes automatically, sit above a Domains table tracking each one’s authorization. An Import history lists every past run. Change API key replaces the stored key without disturbing mailboxes already imported. Disconnect InboxKit or Remove everything sit in the Danger zone at the bottom.

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Good to know

No. InboxKit mailboxes authorize themselves, so nobody sees a consent screen or types a password.
InboxKit is still proving that domain is yours. Its mailboxes import automatically the moment that finishes.
Nothing about your imported mailboxes changes. Oneprofile just stops checking InboxKit for new, removed or returning mailboxes.
With Disconnect removed mailboxes automatically on, Oneprofile disconnects it once InboxKit stops listing it. It comes back on its own once it is active in InboxKit again. Oneprofile notices at its next InboxKit check, then the hourly connection check reconnects it.
You choose: disconnect them and keep their history, or delete them along with it. The contacts they emailed wait for a disconnected mailbox but stop when it is deleted, because no other mailbox emails them. A disconnected one stays Disconnected until you connect InboxKit again and import it.

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Next steps

Connect a mailbox

Connect a Google Workspace or Gmail mailbox instead.

Mailbox health and capacity

Check the new mailboxes once they arrive.