Phishing e-mails have been sent with the subject "e-mail Maintenance", supposedly from the ZIM Helpdesk, informing about a too full mailbox! Users are asked to reply to the e-mail (written in English) by providing their unique identifier and password.
This is of course a phishing attempt! Ignore and delete the mail! Never reveal your access data to anyone else!
Please note our security tips for recognising phishing e-mails: https://wiki.hhu.de/x/4IhYB