How do ESPs track deliverability performance?
ESPs monitor multiple signals: bounce rates by type, complaint rates from feedback loops, delivery rates to major MBPs, and engagement metrics (opens, clicks) where measurable. This data feeds dashboards showing sender and platform-wide performance.
Advanced ESPs add: inbox placement testing using seed lists, blocklist monitoring, authentication success rates, and domain reputation tracking. Some integrate Gmail Postmaster Tools data for senders who enable it.
ESPs use this data internally to: identify problem senders for intervention, optimize IP pool assignments, detect emerging delivery issues, and benchmark platform health. You benefit from this monitoring through better overall platform reputation and proactive issue notification.
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