Why AI agents need their own email keys
Agents that can send email can also leak it. The fix isn't less agent autonomy — it's scoped credentials and gates a human controls.
The shared-credential problem
Most teams hand an AI agent the same API key their production app uses. That key can send email — and export the entire contact list, change domains, read every message log. If the agent is tricked, hijacked, or just confidently wrong, the blast radius is the whole account.
Security teams call this credential over-privilege, and it's the number one objection we hear in enterprise security reviews of agent stacks.
What a scoped agent key looks like
In SendFlit, keys carry an explicit scope. A send-only key can draft and send — nothing else:
sfk_agent_9f2… scopes: email:send, contacts:read cannot: export contacts · modify domains · touch billing
The agent gets exactly what its job requires. An attacker who steals the key gets exactly that — and nothing more.
Approval gates: autonomy with a brake
Scoped keys bound the blast radius. Approval gates bound the consequences. Admins set policy triggers — broadcast size, external domains, new recipients — and sends that match are queued for a human decision:
14:02:11 gate: broadcast > 250 recipients → awaiting approval 14:04:38 admin reviewed → approved, queued 14:04:39 send started — 412 recipients, DKIM signed, logged
Every decision lands in the audit trail: who approved, when, and what the agent asked for.
The pattern, generalized
- One key per agent identity — attribution in the audit trail is per-agent, not per-account.
- Least scope by default — send-only unless the agent's job demands more.
- Gates on irreversible or high-volume actions — anything you'd want to be asked about.
- Rotate independently — kill one agent's key without touching production.
Start governing in minutes
SendFlit ships scoped keys, gates, and the audit trail on every plan — free tier included. Register an MCP client, create a send-only key, and set your first gate before lunch.