A SIEM integration should help an analyst investigate an authentication condition, not create an incident for every failed aggregate-report row. Choose a specific destination and workflow. This guide uses Azure Monitor ingestion and Microsoft Sentinel incident management as a documented design example, with proposed mappings and hypothetical decisions rather than a claimed EmailAuth integration.
Separate observation from finding
An aggregate report records authentication evaluations. A finding adds interpretation such as an approved billing sender unexpectedly losing alignment. Retain the evidence population, time range, known sender, confidence and business impact. RFC 9990 provides the reporting semantics; it does not establish that every failure is malicious or that an incident must be opened.
Use a bounded correlation key containing customer scope, domain, sender and condition. Avoid putting message bodies or recipient addresses into the event when metadata and an access-controlled evidence reference suffice. Include occurrence time and ingestion time separately so delayed evidence is not mistaken for a current outage.
Map to an actual ingestion boundary
Azure Monitor's Logs Ingestion API documentation describes sending data through a data collection rule into a target table, with the associated authentication and permissions. A deployment needs the actual table schema, stream, endpoint, DCR and authorized identity. A successful JSON serialization alone does not prove the service accepted or indexed the event.
A proposed mapping assigns the event_time value to TimeGenerated and defines custom columns TenantScope_s, Domain_s, FindingType_s, EvidenceRef_s, CorrelationKey_s, Severity_s and SchemaVersion_s. These custom names are a proposed schema, not built-in Sentinel fields. TenantScope_s is an application correlation label; it does not enforce Azure tenant isolation or permissions. Configure and test access separately.
Correlate and manage the incident
Decide whether analytics rules create incidents from ingested data or an authorized adapter manages incidents directly. Avoid running both paths without deduplication. The Sentinel Incidents Create Or Update API documents a PUT operation against a specific incident ID for version 2025-09-01, with required title, severity and status fields. Pin the actual version in the implementation and handle concurrency rather than blindly overwriting an analyst's work.
Persist the correlation-key-to-incident-ID relationship. Allocate a distinct incident ID for each trusted tenant-scoped key; reusing one fixed ID across keys can overwrite another customer’s incident. Validate tenant binding before correlation, since a tenant string supplied by an untrusted event is not authority. Repeated observations can update the existing incident with additional evidence instead of opening duplicates. Assign an analyst and a next action. Closure should record what was investigated and why the outcome is justified, using the destination's supported status and classification fields.
Keep customer correlation and analyst decisions separate
Suppose two observations of the same approved sender’s alignment loss map to one customer-scoped incident, while a repeated delivery of the first observation adds no duplicate evidence. A second customer’s otherwise similar finding must map to its own authorized destination and distinct incident identity. Reusing one fixed incident ID across both keys risks overwriting the wrong record, even if the correlation label contains a tenant name.
Separately, an analyst may close the first incident after confirming an expected planned test. A late event must not blindly overwrite that decision or reopen it without the approved lifecycle rule. Retain the existing evidence, evaluate whether the new observation changes the finding and resolve concurrent edits using the destination contract. These are hypothetical decisions, not actual incidents, classification results or executed lifecycle tests.
This guide creates no DCR, obtains no token, ingests no logs and calls no Sentinel API. Before production acceptance, run an authorized test event through the real destination, verify indexed fields and tenant access, exercise duplicate delivery and confirm closure without overwriting unrelated analyst changes. Retain request IDs and observed results. If any stage is missing, label the integration a documented design with pending execution, not a deployed control.