Britain's 400 Years of Cyber Law
Editors, RTFA. This is not about email signatures in the sense of the things people like to put after the "-- " at the end of their emails to add a personal touch; it's about regular signatures (signing your name), and it's about the fact that the LACK of a name or signature in an email means that an email CANNOT be a valid "written offer".
The only thing this means is that if you include your name in your signature (the email signature again, i.e., the part after the "-- "), whatever you wrote in your email can be treated the same way as something you wrote in a regular letter that you signed with your name.
But that's neither surprising nor worrying - quite the opposite. The implicit statement in the story summary that the disclaimers some companies like to put into emails could somehow constitute a valid contract is a big, fat piece of Slash-FUD.
Speaking of which, I propose the term "Slash-FUD" for intentional FUD in and intentionally misleading summaries and headlines of Slashdot stories - the problem seems to have grown so large in recent years that I think it deserves a special name. Death to Slash-FUD! Let that be our battle cry.