I'm not sure how they would fix that, assuming that's even a bug. The email protocol is completely unverified, anyone can send the header they please, including

I'm not sure how they would fix that, assuming that's even a bug. The email protocol is completely unverified, anyone can send the header they please, including spoofed From: headers. The GMail client itself even allows it, when you compose a new email you can change the "From" to anything. That's actually a rather useful feature when you have several addresses redirecting to one gmail address.