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Email inboxes and delivery infrastructure for autonomous agents
Mails.ai provisions real, addressable mailboxes for software agents: a single API call sends, receives and threads replies, and inbound mail is returned as structured events rather than raw MIME. Every incoming message passes a six-category prompt-injection scanner, and each sending agent carries a reputation score that pauses it automatically when the score falls. Cold outreach is refused at the API rather than merely prohibited in the terms, and an MCP server exposes the same operations to Claude and other agent clients.
Free covers 3,000 events and one agent; Pro $20 and Scale $99 raise send and inbound volume plus agent count, with per-call metered pricing announced and a $50/month dedicated IP add-on.
Use tool ↗Worth it if you are shipping agents that email real people and you do not want to build inbound parsing and injection defence yourself. The blanket cold-email refusal is a feature, not a limitation — it is what keeps the shared sending reputation usable.
Watch out: Note the pivot: most catalogue listings still describe Mails.ai as a cold-email outreach suite with unlimited inboxes, and that exact use case is now blocked at the API.
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