Email attachments will be sent to the recipient as 'winmail.dat'
In some cases it can happen that sent e-mail attachments do not arrive in the intended file format (e.g. .pdf), but reach the recipient as 'winmail.dat'. This occurs when sending via the mail program Outlook.
Please configure your email preferences. Please pay particular attention to the settings for using the MAPI interface with Microsoft Outlook 2013.