Controls whether a <code>List-Unsubscribe</code> header is included in outgoing email which enables supporting clients to display a prominent option to allow a user to unsubscribe from emails. By default we recommend the HTTP option. If you select the email checkbox here, an email address must be provided in the "Unsubscribe email address" option below which will receive unsubscribe requests to be processed.<br />
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<strong>Note:</strong> If you choose the email option, it will be your responsibility to monitor the mailbox and manually process unsubscribe requests unless you enable the "Automated unsubscribe email handler" option below.