Try:

http://drupal.org/project/blogspam

I use it on a relatively large site and it stops a lot of spammers. It actually checks the registration info against 3rd party lists for things like:

- Reported IP addresses
- Reported email addresses
- Reported usernames

Jamie Holly
http://www.intoxination.net 
http://www.hollyit.net

On 1/10/2011 6:26 AM, Amala Singh wrote:

Hi,

I get thousands of user registrations which more than 90% are spams. I do not want to
use protections such as Capcha as they give difficulty to the user registrations.

Some one suggest me how I can control the spam registers, though it is moderated,
I do not want to scan and unblock the hundreds of registered users registered.

(PS I use drupal 6.2 for tamil.net)

Cheers
Amala Singh
Tamil.net