A lot of times you get a form where you need to enter an email address (or other form field) twice in order to confirm that you typed it correctly the first time. Some forms disable the copy and paste action (via javascript) in the browser to force the user to type the email address again.
Personally I find this highly annoying. What are your thoughts? Are there other options?
I find it highly annoying as well since, in many cases, the initial entry was done from an autofill that I know is correct.
Please note that this should be a community wiki!
I think it depends on the site, if its something like a commerce site, I'd support disabling the copy and paste because if the address is typed in wrong it can cause pains for both the site and the customer. It's easier for everyone to just inconvenience the customer for 2 seconds during the process instead of having to deal with it later.
I personally disagree with disabling the copy and paste thing. If the user enters the wrong email twice and identically (worst case scenario) it's his fault really.
If you really want to check the email address you could implement a confirm email address function, which sends an email to the provided email address. The email could contain a link which allows the user to confirm his/her email address.
For obscured fields like password fields, it is always best to implement a double entry input field in case the user made a typo.
You should just believe the user. If he mistypes the address, live with it.
First of all, if you confirm registration by sending an email, on the “Now wait for an email and click a confirmation link there” screen you can still show the address to which an email was sent. It can be followed by a link “Oops, mistypes my email address” letting you to correct yourself.
Second, if you use email for notifications, user will not get them, and, curious, he will go to his/her profile settings to check the notification parameters. You just have to make sure that “E-mail” input is next to “Get notifications” checkbox.