Apple Mail Add-On MailButler Presents The New Unsubscribe Feature Posted 8/20/2016 at 12:41 UTC in Mac by gnye@amdesign.net | Permalink | Tweet Berlin-based Feingeist Software today announces MailButler, an important update to the popular Apple Mail add-on for macOS. Among the various functionalities, version 6407 introduces the new time-saving Unsubscribe feature. Now, if a MailButler user doesn't want to receive a newsletter anymore, he or she just needs to press the unsubscribe button, which appears at the top of the email. MailButler will automatically unsubscribe the user from that newsletter.