Negative. Even if I didn't end with my name or whatever and didn't use a sig, they'd still have my email address and my full name, which is really all that is needed. The only time I end with something other than my first name or full name is when I send emails to the sponsor of my senior design project. Since I send him a lot of emails, I always just find the previous email to him in Sent and copy and paste the end note (name, project leader of such and such team, name of university).