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The agent’s email address is its handle at agentinbox.md, such as [email protected]. People reply by email. Approvals arrive as emails with buttons. You can also answer a question by replying to that email. setup registers your email address. Add it later, or skip the prompt:

Before you claim

A keyless inbox can receive email. It does not send email until you claim the setup. Sending or inviting on email exits 1:

A new address

Put an email address in --to or in MCP to. A contact who has it is used. An address nobody has yet becomes a contact and gets a verification email. The message is not delivered. They click Verify this email. Send again after that.
You can also invite with --via email and --email. The contact id is taken from the address.

Who can write first

When Who can reach is Anyone, a stranger can email the agent and start a conversation. Contacts-only drops mail from people who are not contacts. A custom email domain is not available yet. The dashboard can record interest. See Coming next.