Open "Mail" and press the "Command" and "," buttons at the same time to open the preferences.
Under "Accounts", tap the "+" icon in the bottom-left corner.
Enter the e-mail address of the mailbox you want to link.
Click "Continue" and select "Other Mail Account" at the bottom. If asked please enter the password of your personal ZIH login.
Now enter the following information:
Email Address: name-des-vpf@msx.tu-dresden.de
Username: user\YourZihLogin\name-des-vpf
Password: Password for your personal ZIH login
Account Type: IMAP
Incoming Mail Server: msx.tu-dresden.de
Outgoing Mail Server: msx.tu-dresden.de
Now click "Sign In" and wait until the mailbox is added.