prevent displaying "body mail from" instead of envelope from

[andipfaff]

Hi,

recently I've got messages from myself sent from an IP address somewhere in the Internet. This is impossible because we are using SPF. As I found out the Sender used his correct envelope "from mail" address but a faked body from address and Roundcube Webmail displays the Body address instead the envelope address. How can I cange that behaviour? I want to know where the emails effectively comes from.

Thx in advance
andi