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What is ttsender@microsoft.com in Microsoft 365 Message Trace?
Question details
The user is seeking an explanation for unfamiliar entries from ttsender@microsoft.com appearing in the Microsoft 365 message trace.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Reviewing email delivery logs in the Microsoft 365 Exchange admin center or Defender portal.
- Observed behavior
- Message trace logs show entries from ttsender@microsoft.com with a 'GettingStatus' status, yet no corresponding email is actually delivered to the user's mailbox.
Ensure you have Exchange Administrator or Global Administrator privileges in Microsoft 365 to properly run and review message trace logs.
Understand and Verify Microsoft Defender Scanning Operations
Recognize that these entries are harmless background system processes often triggered when Microsoft Defender scans email attachments.
Entries from ttsender@microsoft.com showing a 'GettingStatus' label are typically related to internal background operations, such as Microsoft Defender for Office 365 scanning incoming email attachments for malware. These logs represent a system-level interface interacting with the mail flow rather than a real email being delivered to a user.
Log in to the Microsoft 365 Defender portal and navigate to 'Email & collaboration' > 'Exchange message trace'.
Compare the timestamp of the ttsender@microsoft.com entry with the delivery time of recent emails containing attachments. You will likely find they align perfectly with a scanned email.
Send a harmless test email with an attachment to your own mailbox. Monitor the message trace to see if a new ttsender entry appears right as the attachment is being scanned and released.
Contact Microsoft Support for Tenant Verification
If you suspect abnormal behavior or need a definitive explanation for your specific environment, open a formal support ticket.
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Frequently Asked Questions
Can I block ttsender@microsoft.com in Exchange Online?
It is highly recommended not to block this address. Because it is a Microsoft internal system address used for background operations like Defender attachment scanning, blocking it could disrupt your email delivery and compromise security features.
Why does the message trace say 'GettingStatus'?
The 'GettingStatus' label indicates that an asynchronous internal system check, such as Safe Attachments scanning, is actively processing the email or communicating with background services before the mail flow is finalized.
Do ttsender emails count against my mailbox storage quota?
No. These logs solely represent system-generated trace entries for background operations and are not actual email messages stored inside your Exchange Online mailbox.
