+1 for captcha.  those spams are annoying.

On 11/22/2012 05:45 PM, Heesob Park wrote:
> Hi,
> 
> Recently, I can see many spam messages from ruby-core mailing list
> originated in Ruby Issue Tracking System.
> Is there any idea to stop spam?
> 
> How about adding captcha plugin in user registration process?
> https://github.com/srstclair/redmine_recaptcha
> 
> Regards,
> Park Heesob
> 
> 
>