Scenario
An organization disables legacy app passwords, and a scanner or line-of-business device immediately loses sign-in capability.
Recommended Resolution Path
- Confirm the workflow is still using a basic-auth style mailbox credential rather than a modern relay method.
- Move the device to a scoped relay or application-specific send method where possible.
- Review message tracing so you know whether authentication, transport, or policy is blocking mail.
- Document the replacement pattern so each legacy device is not solved ad hoc.
Technician Notes
Document what changed, what confirmed the fix, and whether the issue points to a broader standards gap worth addressing for the client.
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