An old exception is a review candidate, not automatic proof that its permissions can be removed. Establish what originally required it, whether that need still exists and how the affected service will work afterward. Retirement should reduce unnecessary authority without creating a new delivery incident.
Recover the original reason
Read the exception's scope, owner, approval and intended closure test. Determine whether it concerns an SPF mechanism, a DKIM delegation, DMARC policy, a gateway rule or a reporting exclusion. These have different effects. A third-party DKIM selector and an SPF include are not interchangeable ways of granting authority. RFC 6376, key management and RFC 7208.
If the original reason is missing, label it unknown and assign an investigator. Do not invent a business justification from a familiar provider name. Confirm the actual customer service and tenant, not just the infrastructure brand. Preserve any contractual or operational dependency for the accountable owner to review.
Test the proposed end state
Identify the replacement route and exercise representative flows under an authorised test plan. Record authentication identities, trusted results and business receipt where relevant. Check seasonal and low-volume uses against the business calendar. A short quiet period may miss quarterly campaigns or disaster-recovery notifications.
Use aggregate reports as one observation source, with sender logs and owner confirmation as appropriate. Reports do not cover every receiver or prove a service is inactive. RFC 9990. Document the observation interval and gaps. Absence of evidence must remain distinct from evidence of non-use.
Distinguish readiness from permission to remove
Consider three hypothetical exceptions. EX-01 has a confirmed owner, a verified replacement route and documented review of the old route across the relevant business cycle; it is a candidate for change approval. EX-02 has no current owner and only a quiet short reporting window, so attribution and coverage remain open. EX-03 still serves a scheduled campaign, so removing it before the replacement is tested could interrupt legitimate use.
These are assumed inputs for a decision walkthrough, not an executed retirement model or real verification evidence. Even EX-01 is not automatically removed: the exact dependency, shared uses, current state and approval must be checked. A statement that evidence is complete should name the covered services and time interval rather than imply universal visibility.
Remove only the approved dependency
Prepare an exact before-and-after change and recovery plan. Recheck current state before mutation. If the scope includes DNS, validate authoritative observations afterward and test affected legitimate flows. Cached answers can persist, so the verification period must fit the actual dependency. RFC 1035.
Close the exception only when the approved removal and relevant service outcomes are recorded. Preserve the prior scope, why retirement was justified and any residual risk. If a dependency cannot yet be removed, renew only with an accountable decision and a concrete next action. Repeated renewal without new evidence is a governance finding, not progress.
Verify retirement before closing the record
After an approved removal, retain the exact changed object and verify both the intended loss of authority and legitimate continuity. If either is uncertain, leave closure pending with a named next check rather than erasing the exception history.