List-Unsubscribe headers unsubscribe users directly by removing them from the mailing list. The unsubscribe link will be added to email headers for one-click unsubscription by supported email providers.
To insert it into your email headers, follow the steps below:
Go to the Campaign Options tab, and click on Advanced options
Check the box "Insert unsubscribe link header"
Save the changes
Note: Some email clients or providers (like Gmail.com) might not show the unsubscribe URL as expected. This often happens if the email is categorized as a regular conversation. Such categorization is typical if there's a history of emails exchanged between those accounts, or if the email service considers the other party to be an actual person.
To accurately test the List-unsubscribe feature, use the "Show original" option in your email client, when you receive the email. This allows you to view the full details of the email, including the technical headers. Check here for the "List-Unsubscribe" tag to ensure the feature is active and correctly implemented.
