Many web sites when you registering an account present you with a form where you put in your details such as name and other profile data. One of the fields without a change is email address. It seems that there are quite a lot of web sites that double this field up. They have email address field and then re-type your email address field.
When this comes to password, I can understand the purpose of that. For security reasons operating system and browsers treat the fields of type of password differently and in some circumstances subset of copy/paste operations can be disabled on these fields. Since it is important that there is no mistake in the password, user is asked to repeat it.
I cannot apply the same logic to the re-type email filed. Every time I register an account for a site that has this field I simply copy and paste the fields, and I suspect that most people do the same. Thus I can't see value in having this field.
I'm building a web site and creating an account registration page. I'm not intending putting the retype your email field on it, but may be I'm missing something and it serve some other role that I could not think of?
Is there any other purpose of this field apart from I described above that would justify including it on a account registration screen (be it a web site or desktop or mobile app)?