Email Tracking: Available Now on MailButler Posted 3/20/2016 at 12:58 UTC in Mac by gnye@amdesign.net | Permalink | Tweet Shortly after MailButler release, Feingeist Software GmbH has announced that their Apple Mail assistant will now offer one more feature: Email Tracking. With this new option Apple Mail users will always know if the recipient has actually opened their email. MailButler already offers such features as Email Scheduling, Notes, and Upload to Cloud. The developers at Feingeist Software promise that more new features are planned and will be added to MailButler in future.