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An identity gives an AI agent its own communication surface: a mailbox, optionally a phone number and iMessage support, a publicly reachable internet address (via tunnel) for receiving incoming traffic, and access to contacts and a credential vault.

By default, each identity gets a mailbox on inkboxmail.com (for example, your-agent@inkboxmail.com). A custom email domain lets your identities send and receive email from a domain you own (for example, agent@yourcompany.com) instead. Paid plans include custom email domains, ready to use once you verify the domain.

A recipient is a unique E.164 phone number your agent is connected with over iMessage. On the shared Inkbox iMessage router, the person always texts first: they start the connection by texting "connect @your-agent", so your agent never messages anyone cold. A dedicated iMessage phone number can start conversations, and the recipient cap applies only to the shared router. Recipients can reply STOP at any time to opt out. See the iMessage docs to learn how connections work.

When an organization reaches a shared or dedicated iMessage cap, sends from that pool pause until the cap resets or the plan is upgraded. Incoming messages still arrive. If you need higher iMessage limits without upgrading tiers, talk to us.

You're billed at the overage rates above. To keep overage spending in check, you can set an optional monthly overage spend limit in the Console — once reached, outgoing messages and calls that would incur overage charges are paused until your next cycle. Usage within your included allowances is never blocked, and in-progress calls and inbound usage can take spend past the limit. If overage is a significant share of your bill, talk to us about a custom allowance.

Included SMS/MMS and call-minute allowances, and the overage rates above, apply to U.S. and Canadian numbers. International texting and calling run on international phone numbers, priced per country. Talk to us to set one up.

Receiving keeps working — inbound mail is always accepted, and it still counts toward the inbox's usage. A send that would push the inbox above its cap is refused until space is freed (delete messages or threads) or the plan is upgraded; deleting frees the space immediately. An inbox's current usage and its cap are on the mailbox object in the API.

Yes. Every plan includes IMAP and SMTP access, so you can connect an inbox to a desktop or mobile mail app — you sign in with the full inbox address and an API key scoped to its identity. See the mail-app guide for connection settings. One limit to know about: signed or encrypted mail cannot be sent from a mail client while the "Sent via Inkbox" footer applies, because the footer cannot be added without invalidating the signature — send unsigned, or remove the footer on a paid plan.

On a paid plan, an organization admin can add 250-minute/month ($7/month) or 2,000-minute/month ($50/month) packs from the Billing tab in the Console, in any combination. Pack minutes are shared across all your agent identities, cover inbound and outbound calls, and are used once the organization has used its included minutes, before any overage. A new pack is charged a prorated amount for the rest of the current billing cycle, and its full minutes are available right away. Removing a pack takes it off your subscription immediately, with no credit for the rest of the cycle, but its minutes stay available until your next billing date.

Yes. Developer and Startup are available billed annually at $300/year and $2,000/year, two months free compared with monthly billing. Included allowances still reset every month, and overage, minute packs, and campaign fees are billed monthly. Moving from monthly to annual takes effect right away, with credit for the unused part of your current month. Moving from annual back to monthly takes effect at your next annual renewal.

No. Allowances reset at the start of each billing cycle.

No. Prices exclude applicable taxes.