Question About PROMOX Mail Gateway

Hi,

I'am newbe in here. i have a question, is posible promox mail gateway using previously installed mail server?
i already have dedicated mail server running using centos 6.4 and with latest postfix.

i was looking at documentation, it should remove all harddrive, and install promox mail gateway.
is there posible to use promox mail gateway without loosing all data on harddrive?

Thanks
 
No, the mail gateway needs a full hard disk and installs a complete OS.