In order to receive your e-mails on your iPhone or iPad, please use the settings recommended by Apple.
You may need to enter the following technical data:
Some e-mail programs delete your e-mails only locally on the device used by you and not in the university's webmail system. Therefore, your inbox quickly becomes full and you can no longer receive e-mails.
After you have added your e-mail account to your device, please check if your e-mails are also deleted in your inbox of the webmail system. If this is not the case, we recommend to regularly delete the e-mails in your inbox: