Someone can answer me????? Font in the head of answer/forwarding

Good morning,
this is the fourth time I try to receive an answer, is impossible that nobody has the same problem.
I would like to buy your software, but, before, I want to have an answer!
How is possible, in case of answer or forwarding of an email, maintain, in the line _ From, To, Sent  and  Subject, _ the font selected by the sender (original font) and not use the font that the user has selected for new message (in my case Cambria)? 
Thanks in advance, Alessandro