{FIX} Outlook sends 'Winmail.dat' attachment to recipients.
For several years now I have faced the "winmail.dat" attachment issue, which is caused by an incorrectly configured Outlook email client. During this issue, every email that is send from an MS Outlook client, to a recipient that uses an email client different than Outlook (e.g. Thunderbird), it contains an attachment called "winmail.dat",