If you use a different operating system or have an Exchangemailbox, take a look at the available instructions for the Communigate account or the instructions for configuring an Exchange mailbox.
Now complete the information as follows:
SERVER FOR INCOMING E-MAILS
Hostname: mail.rptu.de
Username: Your RPTU e-mail address (e.g.: rainer.zufall@rptu.de)
Password: Your RPTU password
SERVER FOR OUTGOING E-MAILS
Hostname: smtp.rptu.de
Username: Your RPTU e-mail address (e.g.: rainer.zufall@rptu.de)
Password: Your RPTU password
Then select "Next" in the top right-hand corner.