Re: One thing is very interesting
There are plenty of valid reasons why the "reply-to" address may be different from the "from" address. And anyway, if you insist on making an issue of it, both of those headers are trivially easy to set to whatever you want.
What we really want to police is (a) executable attachments (obviously), and (b) links. There's been some progress on both these fronts. For instance, Outlook will no longer open a link embedded in an email just because you preview, or even open, the email - you have to either tell it to download external content, or click on the link manually. That's a step in the right direction.
Executable attachments are harder, but Windows 8 is making progress even on that front - Windows Defender and SmartScreen are pretty good, as far as they go.
But honestly, there's only so far you can go with technology. Microsoft is in a bind because it's committed - still - to the idea that you can do anything with a PC. (Unlike, say, an iPad, whose main selling point is that you can't do that, and therefore there's so much less to worry about.) That means that, sooner or later, the user must be able to bypass your security. And as we all know, if they can do it, they will.