You can validate the CounterMail-Engine, our Java applet, by looking at
the information window you see the first time you register or login to
your account. You will be notified by a popup window that informs you
about our Java-applet.
This is how it should look like on Windows (you may have another language on your computer), you should click Run on this.
If you for some reason get a window where it says: "The digital
signature cannot be verified by a trusted source..." (look at the
picture below), then it's not correct, do not accept this, click on
Cancel and contact us. Incorrect (this could only happen if someone created a fake one!)