How to track delivery between systems (CRM → ESP → inbox)?

End-to-end tracking across systems requires deliberate instrumentation:

Event chain tracking: CRM: Log trigger event with unique ID. ESP: Receive event, log processing, send email. Inbox: Track delivery status, opens, clicks.

Implementation approaches: Pass-through IDs: Include original event ID through all systems. Enables tracing any issue back to origin. Webhook callbacks: ESP notifies CRM of delivery outcomes. CRM record updated with send/delivery status. Consolidated logging: Central log aggregating events from all systems. Timeline view of complete journey.

Metrics to track: Time from CRM trigger to ESP receipt. Time from ESP send to delivery. Delivery and engagement rates by originating system. Failure rates at each transition.

You cannot optimize what you cannot see. Cross-system visibility reveals where journeys break down.

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