Well, I'm looking for a workaround for years and nothing! As far as I know Modest has a completely open-source.... Maybe it's time to suggest that for the Community SSU.
If anyone here it's thinking, to solve this problem just reply the message and change the Re: for FWD: that;s not good. If are any file attached I need it in the message too...

Well, if someone have a workaround I'll be forever grateful...

Best Regards