We created SPAM Filter ISP to implement what many SMTP servers lack: Spam Filtering. SPAMFilter ISP's implementation is very simple. Its use is designed for ISPs and companies running their SMTP servers, not end-users. SPAM Filter ISP is designed to be a gateway to your incoming SMTP server. SpamFilter ISP receives all emails addressed to your domain(s) and uses several different filtering methods to detect spam. Spam-free emails are then forwarded to your SMTP server(s) (see details here).
Ispconfig Spamfilter Konfigurieren
End-users have web access to view their own quarantined emails. An optional anti-virus plugin is available to stop email viruses.