List-Unsubscribe Header Not Showing Up in Emails

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Issue Description
You have sent an email and do not see the List-Unsubscribe headers.

Issue Resolution
Marketo automatically adds the appropriate List-Unsubscribe headers to emails, EXCEPT in three scenarios:

1) The email is marked as operational

2) You are sending a test email via the "Send Sample" action

3) The email is an alert email

In these cases, the List-Unsubscribe header will not be added to the email.