Can a customer portal user change his email?

Can a customer portal user change his email?

Hi,

I would like to know if a customer portal user can change his email?

Because sometimes we want to create the account for the user (a customer portal user) and fill it with data and give it to him for testing instead of just inviting and then asking them to give us their password, so we thought that we could create the account using a random email and then change it back the client's email once everything is tested, but we don't know if that is possible.

Thank you.