I paid off my student loan (which was held by Nelnet). I expected a big "congratulations" email with some form that proved I'd paid the loan off. Maybe that will still come in the post. Is there anything in particular I should print off of their website, as proof that I paid the loan off?
Generally the monthly statement would have this information. The year-end statement detailing interest paid should show your final balance as well. Either of these should provide sufficient proof.