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What are the limitations of free inbox monitoring tools?

Free monitoring tools have significant limitations:

Small seed networks: Fewer test accounts means less statistical confidence.

Limited providers: May only cover major providers, missing regional or corporate coverage.

Basic reporting: Less detailed analysis than paid alternatives.

Usage caps: Limited tests per day or month.

No continuous monitoring: Point-in-time checks only, not ongoing surveillance.

Free tools work for occasional spot checks and troubleshooting. Serious monitoring requires investment.

A handheld compass helps, but it is not a full navigation system.