kh-berlin.de e.mail address (employees)

• I work for the university and would like a personal eMail with @kh-berlin.de
• How to change mail box presets to not delete possible Spam mails right away?
• How do I set up my university email address on the Mac?
• How do I set up an out-of-office note for my weißensee eMail?
• My "weißensee" mailbox is very full. How can I archive important emails and free up space? (macOS X)