Email trace in Exchange Online basics
Overview
Traces answer “did message arrive, where stuck, why bounced?”
Steps
EAC → mail flow → message trace; filter by sender/recipient/time window.
Read output
Delivery vs Failed vs Pending with enhanced codes.
Limits
Retention of trace history shorter than backups—capture screenshots for disputes.
Escalation
If tenant-wide delay, check Service Health advisories before deep diving.
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