Biosecurity Alerts - Unsubscribe link function

[kylie-m]

Analysis required

• how unsubscribe function could work if we are no longer requiring subscribers to have an ALA account (ie. cannot link it to their profile)
• legal requirements
• if manual unsubscribe is a viable option

[kylie-m]

Unsubscribe is working successfully for a newly created account by an ALA Admin ("Activated" and "Locked" status) that has not been activated by the user using the email link.
The Unsubscribe link in the alert email footer takes the user to a confirmation button, then a success message. (screenshots included)
(Documented in Biosecurity Alerts full functional testing)