My users are complaining because their email messages say the Firebox removed a file called winmail.dat. No-one is sending them files with that name.
This is a pretty common issue with older version of firmware and a knowledge base article, below, was release regarding the most common cause of this behavior and how to address it.
Why do email attachments sent through the SMTP-proxy appear as Winmail.dat attachments?
Eugene Torre | Support Engineer