Notsharingmy.info is a site that will instantly build “anonymous” email addresses that will route email to your real address automatically. As their website states: “We’ll give you an obscure email address that you can give out whenever you want to remain anonymous. All mail sent to that address will be forwarded to you. You can have as many surrogate addresses per one “primary” address as you like.”
As an educator you can give out an address to students that is unique to them (ex: email@example.com) without giving them access to an email account. Any mail arriving for that address would simply get routed to the “real” email address you entered on setup.
To create multiple anonymous emails that get forwarded to the same account, use the same URL address that opens when you make the first email address and go back to the original address as often as you need to create multiple address.