Why does mail.kde.org relays SPAM messages.

[Spel]

>From the moment I subscribe to one of your list, namely kbabel-RoXCvvDuEio at public.gmane.org,
I started receiving SAPM on a regular basis. Just have a quick look at
the KBabel Archives http://mail.kde.org/pipermail/kbabel/ and you will
see lots of viagra and pharmacy related subjects messages.

Why does the KDE organization accept those messages to get through and
passed on to subscribers?