anti-spam

Make your site anti-bot?

I remember a site closed due to misuse and i wonder if bots have a part of it. If the bot is POSTing something to my site what are ways i can combat it? I was thinking of setting some cookies and having the cookies changed via javascript + timestamp and sign (so yesterdays cookies cant be used today and next week). I'm sure most people/...

Looking for open source anti-spam systems, any suggestions?

Basically speaking, we have a forum-like systems and every one can post their demand/supply information. So we need an anti-spam system to avoid the spams like the ads, politic-sensitive, porn, etc. Our requirements: a) open source b)we can tune its features as we need c) can be deployed on LAMP systems By the way, the system could...

dspam vs spamassassin vs bogofilter

I just wonder what their pros and cons are, and which is better for production use. Thanks~ ...