Jeremy Fontenot / Technical portfolio

Microsoft 365 Messaging & Security Administration

Practical administration. Documented results. Original technical evidence.

Objective and implementation

Document messaging administration and investigate a Conditional Access block in a Microsoft 365 Developer tenant. Technologies: Exchange Online, Entra Conditional Access, Microsoft Graph licensing, and Microsoft 365 administration.

Sanitized command evidence records the shared mailbox, FullAccess/SendAs delegation, distribution group, and external-sender transport rule. The validation record documents the policy-scope investigation and post-remediation authentication.

Troubleshooting and unresolved discrepancy

The record describes error 53003 caused by external-user policy scope including all users. It documents narrowing the scope and a successful sign-in with MFA. Separately, licensing UI/service behavior conflicts with Graph assignedLicenses and assignedByGroup metadata. That discrepancy is not resolved here. Intune PendingInput and PendingActivation remain non-final states.

Scope and limitations

Personal Microsoft 365 Developer tenant. The evidence README is synchronized with the current COMPLETE project status. Group-license UI evidence and Graph metadata were not fully reconciled; the discrepancy remains part of the claim boundary and is not represented as resolved.

Registry status retained in the audit: COMPLETE — based on current public routing, current `projects/README.md`, and the live portfolio. . Evidence below is assessed by artifact type; this package does not rerun the lab.

Read the retained project registry and its stated scope

Tasks, results, and supporting proof

Evidence 1

Sanitized command evidence records a SharedMailbox with FullAccess and SendAs delegation.

Open command-evidence.txtconfirmed from explicit output fields
Provenance

Source: evidence-library/projects/m365-messaging-security/command-evidence.txt

SHA-256: f6cc90250e8ef941da9923e89f5c5ad558411ca7907d90716470a1917e2d1ea8

Evidence 2

Sanitized command evidence records an enabled, enforced external-sender subject-prefix pilot rule.

Open command-evidence.txtconfirmed configuration; delivery behavior is separately documentary
Provenance

Source: evidence-library/projects/m365-messaging-security/command-evidence.txt

SHA-256: f6cc90250e8ef941da9923e89f5c5ad558411ca7907d90716470a1917e2d1ea8

Evidence 3

The retained validation record documents Conditional Access scope remediation and a successful post-remediation MFA sign-in.

Open validation.mddocumentary support confirmed; licensing UI/Graph inconsistency remains unresolved
Provenance

Source: evidence-library/projects/m365-messaging-security/validation.md

SHA-256: f00caea1a663104354327d69cb8368df5a19d662d45dd8ea7f7a928e00c42233

Top