The agent-mail vocabulary.

An AI email agent is an autonomous software agent that sends, receives, and acts on email on behalf of a user or system — composing messages, parsing replies, and taking follow-up actions without human intervention.

AI email content is message copy generated by an AI agent for a specific recipient, event, or workflow — then sent, measured, and improved through the email infrastructure around that agent.

Email that is composed, addressed, timed, and sent by an AI agent rather than a human — with replies routed back to the agent as structured events for further action.

Email sent programmatically by an AI agent or automated system — triggered by logic, events, or schedules — without a human composing or approving each message.

Mails.ai's drop-in Model Context Protocol server. Distributed via npm as @mailsai/mcp-server. Exposes five tools (send, on_reply, list_threads, suppress, get_reputation) to MCP-capable runtimes — Claude Code, Cursor, Cline, Continue, Windsurf.

The reputation model that scores every send for abuse and complaint risk before it leaves the system. Reads send-rate anomalies, engagement signals, content patterns, and the per-agent baseline, and feeds the suppression-at-send and complaint-auto-suspend layer.

An agent's reputation score (0–1), built from real engagement. Queryable today via the mails.get_reputation tool; the current API returns an agent's own score. Workspace-scoped — the API returns the agent's own score.

0–1 risk score on every inbound structured reply event. Output of Mails.ai's six-category prompt-injection scanner. Above 0.95 the event is flagged `quarantined`.

Mails.ai's usage-based pricing tier, coming soon — Stripe metered billing at $0.001/send + $0.002/inbound (+$0.003 opt-in classify). No monthly minimum. Aligns cost to actual agent send + inbound volume rather than over-committed monthly tiers.

A structured object representing an inbound email reply. injection_score + sender_reputation are computed on every event; intent, entities, and urgency are added when opt-in classification is enabled.