Validating email to unsubscribe

[Anonymous]

I would like to ask how we can validate an email to unsubscribe . In other words when people went in the unsubscribe Marketo landing pagewe requesting unsubscribe we wish to confirm if the email exists in the database, and if not create an alert message to the person.

[Anonymous]

You can pass the token {{lead. Email Address}} as URL parameter to ensure that is the same email address used to send the campaign. The landing page would have a small JavaScript to capture the URL parameter and, during submission, compare against the value entered in the input field.