How to use Gmail Postmaster and SNDS as change indicators?

Gmail Postmaster Tools and Microsoft SNDS serve as change indicators by revealing shifts in how providers view your sending. Reputation changes, complaint rate shifts, and delivery error patterns in these dashboards often precede visible deliverability problems.

Monitoring these tools regularly establishes baselines that make changes obvious. A sudden reputation drop from High to Medium in Postmaster Tools signals problems requiring investigation. Rising complaint rates in SNDS warn of developing issues.

Correlating dashboard changes with sending activity helps distinguish sender issues from provider changes. If reputation drops without corresponding sending changes, provider filter updates may be affecting your classification. If changes follow sending changes, your own actions likely caused the shift.