If students have school email accounts, then the teacher can sign them up for LitPick using school email addresses and passwords that the teacher creates (and records).

If the students do not have school email accounts, here's an article that explains how to get multiple uses out of one gmail account. Basically, if a sponsor sets up a gmail account and then uses a +student name or number, he/she will be able to get all of the emails sent to that account.

From there, you can set up filters so each student could have a folder where their mail gets dropped into directly. 

http://techverse.net/create-multiple-custom-email-address-one-gmail-account/