Make Doxis-Viewers scrollable beyond dina4 for E-Mails

The Doxis Viewers (winCube & webCube HTML5) are always rendering E-Mails (tested with .msg) into A4-Format. As a result E-Mails that exceed A4 are not displayed correctly.

Openend in the system viewer (Outlook) the window is resizable without restriction to a layout like a4, showing exceeding content with a scroll-bar. We would like the Doxis Viewers to do the same.