Spam-Abwehr für CMS/Blog/Forum - Wie kann ich Spammer stoppen?

Hallo,

wir betreuen mehrere Kunden, die selber CMS, Blog oder Forum betreiben.

Spam ist ein großes Problem. Captchas helfen nicht mehr. Wie kann man Spammer abhalten, während normale User unbeeinflusst ihre Kommentar posten können?

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