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We have confirmed an issue where automated emails from our production environment are completely missing from a recipient's mailbox, despite explicit server logs confirming successful database commit.
Technical Diagnostics Completed:
Tracking Log Status: Get-MessageTrackingLog confirms a definitive DELIVER event via the STOREDRIVER source.
Recipient: user
Senders / Timestamps tracked:
sending email address on 6/11/2026 at 11:44:29 AM
sending email address on 6/17/2026 at 8:32:02 PM
Mailbox Inspection: Looked in Inbox, Junk Email, Deleted Items, and the In-Place Archive via OWA with an "All Folders" scope. Messages are missing.
Security Inspection: Checked Microsoft Defender Quarantine for this recipient and timeframe. The quarantine is completely clear; Zero-Hour Auto-Purge (ZAP) did not interact with these messages.
Because the STOREDRIVER confirmed successful delivery to the store database, the message vanished after acceptance. We need an Exchange engineer to pull the backend mailbox audit and transactional logs to determine what process or database event purged or dropped these messages post-delivery.
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