Summary
- Microsoft Defender for Office 365 is adding two new Advanced Hunting tables for email submissions: SubmissionEvents and SubmissionResults.
- Security operations teams can query email submission activity and submission outcomes alongside other Microsoft Defender XDR data.
- The new tables can be used in Advanced Hunting custom detections to support SOC workflows and investigations.
- No immediate admin action is required, but teams should review the new schema and documentation when it is released.
Primary Service: Defender XDR
Admin Impact: Low
User Impact: Low
Release Start: 01 Oct 2026
Release End: 01 Oct 2026
Services: Defender, Defender XDR, Exchange
Category: Stay informed
Tags: Admin Action, New Feature
History
9/30/2026 Item Added to Message Center
Microsoft Message
Microsoft Defender for Office 365 is introducing new email submissions data in Advanced Hunting in Microsoft Defender. The new submissions tables provide security operations teams with greater visibility into email submission activity and results, enabling analysts to query submission activity alongside other Defender data and build hunting and detection workflows tailored to their organization.
Rollout Schedule
- Public Preview (Worldwide): We will begin rolling out in early October 2026 and expect to complete by early October 2026.
- General Availability (Worldwide): We will begin rolling out in early October 2026 and expect to complete by early October 2026.
Impact on Your Organization
Who is affected
- Security operations teams that use Advanced Hunting in Microsoft Defender.
- Admins and analysts who investigate email submissions and submission results.
Platforms/Services
- Microsoft Defender for Office 365
- Microsoft Defender XDR
- Advanced Hunting
What will happen
- Two new Advanced Hunting tables will be available: SubmissionEvents and SubmissionResults.
- SubmissionEvents provides information about email submission events.
- SubmissionResults provides information about the results associated with those submissions.
- Security teams can query submission information directly and correlate it with other Microsoft Defender XDR data.
- The tables can be used with Advanced Hunting custom detections, allowing organizations to create detections based on submission activity that is important to their SOC workflows.
Action Required/Recommendations
No immediate action is required. Additional documentation for the new tables will be provided as part of the release.
Compliance considerations
No compliance considerations identified. Review as appropriate for your organization.