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agent-email-guard

Library that caps and checks the email an AI agent sends: budgets, rate limits, loop detection, approval holds and a kill switch.

  • AI agent framework
  • Free

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Pricing

Free and open source (MIT).

Overview

agent-email-guard is a library you wrap around the email-sending code your AI agent uses, with nodemailer, Amazon SES, Resend, Postmark or any SMTP server. You set hourly, daily and monthly budgets per key, a per-minute rate limit, loop detection for repeated messages, a suppression list, and holds that need a person before mail goes to important or new recipients. Each send is allowed, held for approval or refused with a plain reason, and one call pauses all sending. It runs inside your agent's process, so the agent's own code could remove it; use a shared Redis or Postgres store across processes, or enforce the rules at your mail API.

Key features

  • Hourly, daily and monthly send budgets
  • Per-minute rate ceiling
  • Loop and repeated-message detection
  • Approval holds for important or new recipients
  • Kill switch that stops all sending
  • Node, Python, PHP and Go packages

Use cases

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Last updated 2026-11-10

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