These E-mails are an attempt to defraud. Their goal is to steal your passwords and access your accounts.
Neither the ZIM or other bodies of the university will ever send e-mails, asking for passwords.
Ignore those e-mails. If you have responded to such an E-mail, please change your password immediately, using the following link: account.uni-wuppertal.de
Other important information about "phishing" can be found at the Federal Office for Security in Information Technology. Click here.