01Define the boundary
Identify the actor, target resource and operation that custom email providers is meant to govern.
02Configure the policy
Verify sender identity and domain configuration, test delivery in the intended environments, and define monitoring and a fallback process. Never include credentials or reusable secrets in notification content.
03Exercise the edge cases
A recovery notice uses the organization’s configured sender and directs the user to the intended verification flow without disclosing sensitive recovery data. Also test the path that should be denied, deferred or sent for review.
04Review the outcome
Check that the resulting state is understandable and that the decision can be investigated later. For audit-enabled operations, confirm the relevant actor and context are captured.