Thank you for contacting the Turnitin help desk regarding your question about emails. Emails are only used when logging into there accounts and submitting papers that is it really. The digital receipt is generated after submissions. You can set up email address using numbers instead of names, I have pasted instructions to create accounts with no email addresses.
If you need further assistance please let me know.

******There is a method for students without an e-mail address to create an account. However, this means they will need to write down and keep in a safe place their secret question and answer, as this will be the only way for them to retrieve their password in the future. There is no other way we can give out the student’s password except by secret question and answer confirmation, unless the student has a valid e-mail address for
us to send automatic password resets to.

Students will also need a class ID number (seven digits, found to the left of the class name on the instructor’s page) as well as the enrollment password to join the class.  Please note, instructors should not add students with fake e-mail addresses into their class; students without a valid e-mail address must enroll themselves into the class. If a student looses their secret question and answer combination, they will need to create a new account and will not be able to access their old account.

Here are the instructions for students without an e-mail account to create a user profile on Turnitin:

To create your account, please do the following:
1. Go to http://www.turnitin.com
2. Click on the “New Users” link below the sign in box.
3. Follow the profile creation wizard.
4. When you are prompted to enter an e-mail address, please enter your email address in this format:
FirstnameLastname@(schoolname).turnitin.com
If this tells you another person has used this login name previously, use this format:
FirstNameMiddleInitialLastName@(schoolname).turnitin.com
or
LastNameFirstname@(schoolname).turnitin.com

Any other e-mail address entered may actually exist and register an unknown person on Turnitin. That person could then control your account. Please do not use any ‘false’ email address or domain name except as shown above.

For example:

5. Continue with the profile creation process as prompted. At the end of the creation please log into your account. If you have not written down your password and secret question and answer, do so now.  View your secret question and answer while logged in, go to ‘user info’ at the top of your page and click on it. This will bring you to a screen from which you can change your password or secret question and secret answer.

Any other e-mail address entered may actually exist and register an unknown person on Turnitin. That person could then control your account. Please do not use any ‘false’ email address or domain name except as shown above.

Please write down your secret question and answer choice, as well as the e-mail login @(schoolname).turnitin.com, as these will be vital to using Turnitin. If you forget your password and do not have an actual e-mail address, we will only be able to re-set your password through the ‘password help’ link on our website if you enter the correct secret question and the
answer to it. If you loose this information, you will not be able to access your Turnitin account again. Make sure your “Email” login and your password as well as the secret question and answer are in a place they will not be lost. If you need to, make a copy of them.

When you finish and exit the wizard, you can log in to your account by entering the @turnitin.com e-mail address and the password you created in the appropriate fields of the sign in box and pressing “Log In.”

You can also find our student quick start video at:
http://www.turnitin.com/static/training_support/student_training.html