How did you obtain these .edu emails? Does the university/college your using allow selling their emails?
How long will these accounts last?
I obtained them legitimately and by no means these emails are cracked. The university's definitely do not have any policy on selling of these, so you are safe using the emails. These emails do not have a fixed time period, so they will last forever.
Do you offer any guarantee/replacement if any of the email accounts gets suspended?
How much storage does the university/college offer?