What are safe daily sending limits for cold email?

Safe sending limits vary based on domain maturity, reputation, and engagement quality.

Conservative guidelines:

• New domains (first 2 weeks): 10 to 30 emails daily
• Warming domains (weeks 2 to 6): 30 to 75 emails daily
• Established domains with good reputation: 75 to 150 emails daily

Provider limits:

• Google Workspace: 2,000 daily per user, but cold email should stay far below
• Microsoft 365: 10,000 daily per account, but same principle applies
• Provider limits are technical maximums, not recommended volumes

Factors affecting your limits:

• Engagement rates (higher engagement allows more volume)
• Bounce rates (high bounces require lower volume)
• Complaint rates (any complaints require caution)
• Domain reputation scores

Warning signs you're too high:

• Rate limit errors from providers
• Increasing spam folder placement
• Declining reputation in Postmaster Tools
• Deliverability tests showing problems

Volume should follow reputation, not ambition. Push too hard and the vessel takes on water.