No kidding! I have a really simple email address, I signed up early enough at Gmail that I managed to get my first name, which is also apparently a surname. So, if my email was smith@gmail.com, every person whose email is jsmith@gmail.com, or bsmith, or whatever, whenever they accidentally leave off their initial on their email address when they sign up for shit, I get all their email. One lady was trying to get a loan for a car, and every single day for a week, I got five emails with a link to print off the forms she needed, because she was apparently too retarded to check her account profile to figure out why she wasn’t receiving her emails. And this sort of thing happens regularly. Just last week, I had a lady accidentally enter my email address when she signed up for a 160-dollar professional association membership.
So, I’m definitely in favor of forcing people to enter their email twice, and disabling copy and pasting, because people really are stupid and/or careless enough to warrant it.