Beyond a reasonable doubt does not mean beyond any hypothetical, fanciful, or possible doubt. I think you'd have a hard time providing a jury with a reason to b

Beyond a reasonable doubt does not mean beyond any hypothetical, fanciful, or possible doubt. I think you'd have a hard time providing a jury with a reason to believe a particular e-mail was forged, particularly if there is other corroborating evidence. And that only applies in criminal proceedings - under a preponderance standard you'd have even more of an uphill battle.