This is a web-based mail service. You can log in here.
It is recommended that you use HTTPS (Secure HTTP) to avoid exposing your password.
You are currently using an insecure, non-encrypted connection. Click here to switch to secure mode.
NOTICE! To avoid seeing mesages about the Certificate not being trusted, you can install the CAcert root CA certificate by clicking here and following the directions for your browser to install the certificate.
You have to connect to "mail.horsten.com" if you want to avoid a warning about the certificate being issued to the wrong name.
Again, you can install the CAcert root certificate (see above) to avoid warnings about the validity of the certificate.