dataflowbook

Help: /unsubscribe
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The "/unsubscribe" page:

Users visit this page to be delisted from email alerts.

If a valid subscriber code is supplied in the name= query parameter,
then that subscriber is delisted.

Otherwise, If the users is logged in, then they are redirected
to the /alerts page where they have an unsubscribe button.

Non-logged-in users with no name= query parameter are invited to enter
an email address to which will be sent the unsubscribe link that
contains the correct subscriber code.