image captcha not preventing spam

Hi guys,

captcha working fine, but we are running a sweepstake.
Now it seems that some kind of organised sweepstake portal spamming our db...

Any idea what we can do?
Is there any stronger captcha availaible - every minute one mails get dropped with
- different IP
- real email - just added after email a 6 digit number before the @

thanks in advance
M

ok just recon a similarity.
All emails comming with the IP
84.142.

the last 2 digits always changing.

how can i block these IPs?

thx
M

Hi Tullski,

Fredrik posted a serverside validation snippet here that will probably trap these for you.

Bob