Pidgeon
A shared mailbox where every agent gets its own address
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agent-email-guard
Rate limits, duplicate checks and a kill switch for email sent by AI agents
If an agent in your product can send email, this is a cheap seatbelt against it spamming a customer when a timed-out call gets retried with new wording.
agent-email-guard wraps the send function your agent already uses and returns allow, hold for approval, or refuse. It caps sends per minute and hour, blocks near-identical mail to the same inbox, holds first messages to new recipients for a human, and offers one call to stop everything. Libraries cover Node, Python, PHP and Go, plus a Claude Code hook and an MCP proxy. It is MIT, from AgentiSend, whose paid API enforces the same rules server-side.
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