Some client software hides the From and Reply-To addresses, only showing the name by default. A friend's accountant got hit because the From had my friend's nam

Some client software hides the From and Reply-To addresses, only showing the name by default. A friend's accountant got hit because the From had my friend's name, but the address itself was bogus but hidden, so he opened the attachment. So keep the main headers text-only as well (which most sane software does anyway).