My email account got 'hacked' by the Chinese (not really hacked, just reused the same password). From there they broke into multiple other accounts by password

My email account got 'hacked' by the Chinese (not really hacked, just reused the same password). From there they broke into multiple other accounts by password recovery. I got control of the account back. But few years later, someone used my email to register at some Singaporean university. Since then I keep receiving emails from multiple departments telling me about exams and my lack of attendance.