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.