Rate Limiting

Volume controls that protect your sender reputation from runaway sends, ISP throttling, and agent-driven spikes.

When to use this skill

• Setting up rate limits for a new sending system or email integration
• Seeing 421 SMTP errors or deferred delivery from Gmail, Microsoft, or Yahoo
• An AI agent or automated system is sending email and you need guardrails
• Configuring per-domain throttling to avoid overwhelming recipient mail servers
• Debugging why sends are being blocked or queued unexpectedly
• Planning a large batch send and need to calculate safe sending rates
• Your email provider suspended or throttled your account for volume spikes

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