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Exchange Online tracking shows DELIVER via STOREDRIVER but emails are completely missing

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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:
1. sending email address on 6/11/2026 at 11:44:29 AM
2. 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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Saif Ali Sabri 2,706 Moderator on at

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The scenario you describe — where Exchange Online tracking confirms a DELIVER event via STOREDRIVER but the messages are absent from the mailbox — indicates that the transport pipeline successfully handed the message off to the mailbox database, but a subsequent mailbox‑level process removed or suppressed visibility of the item.
Based on your diagnostics:

Message Tracking: The Get-MessageTrackingLog entry with DELIVER and STOREDRIVER confirms the message was committed to the mailbox store.

Mailbox Inspection: Inbox, Junk, Deleted Items, and Archive have been checked with “All Folders” scope, confirming the item is not user‑visible.

Security Inspection: Microsoft Defender quarantine and ZAP are clear, ruling out security filtering.

At this point, the transport pipeline is no longer in play. The next step requires Exchange engineering escalation to review mailbox audit logs and store transactional traces. Specifically:

Mailbox Audit Logs: Verify if a client action (MAPI, EWS, ActiveSync, Outlook Mobile) or a background assistant (e.g., Calendar Assistant, Junk Mail Assistant) deleted or moved the item immediately after delivery.

Store Transactional Logs: Inspect the MDB logs for the recipient’s mailbox around the timestamps (6/11/2026 11:44:29 AM and 6/17/2026 8:32:02 PM) to determine if a purge or corruption event occurred.

Transport vs. Store Boundary: Since STOREDRIVER confirms commit, any disappearance is a post‑delivery mailbox store event, not transport.

Recommended Action Path:

Escalate to Microsoft Exchange Online support with the recipient’s UPN, message IDs, and timestamps.

Request backend store log correlation to identify whether the item was deleted by a mailbox assistant, a retention policy, or a corruption repair process.

Confirm whether retention tags, journaling, or mailbox rules are silently purging these items.

If no logical purge is found, request a store integrity check for the affected mailbox database.

This is not a transport issue — the DELIVER via STOREDRIVER proves handoff succeeded. The missing messages must be traced through mailbox‑level auditing and store diagnostics to identify the purge mechanism.

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Shaluma 242 on at

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Hi,

Please Check the following URL'S
Microsoft doc: Configure and send email - Finance & Operations | Dynamics 365 | Microsoft Learn
Microsoft confirms mailbox auditing logs actions:
Manage mailbox auditing | Microsoft Learn

Thanks,
If you found it helpful, please consider marking it as verified — it may be useful for others in the future!

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