List-Unsubscribe Header

The email client displays the following if the email has a piece of hidden code, called a List-Unsubscribe header.

The List-Unsubscribe header is automatically added to all your emails sent out of EmailOctopus. This header, if displayed, cannot be removed. 

Please keep in mind that it is up to the mailbox provider to decide whether to display the List-Unsubscribe header added to your campaigns. This is generally based on your sender reputation. 
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