Okayama University: a lecturer's mail account was hijacked and sent about 1.5 million spam emails

One lecturer's mail password was stolen, and at the end of January outside access used the address to send about {n:1500000} spam emails. The university disclosed this on 2020-02-28. The lecturer was reported to have reused the password on other services. [1] [2]

No reading of mail, leak of personal or other confidential data, or secondary damage was found. [1]