I read everything about double opt-in on this site and I saw on Sign up: Double opt-in still best practice? What about mobile? answers someone speaking about sending a confirmation code instead of a confirmation link by email. It works like that :
- User fills in form and enter an email address
- As soon as the email address is validate, a confirm code is sent to the user's email, requiring him to fill this code in the form in order to validate it.
- the user comes back to the form and fills the code. Once he clicks done on the form, he is registered and double opted-in by anticipation.
As a UX designer, I really don't like the idea of being forced to validate a process while having a crucial information given in another tool. I really much prefer providing a link to confirm a form registration. What do you think?