Captcha while making posting on forum

I have a forum site (www.sudosan.com). I added captcha for preventing spam posts while making new thread or post. Is it good idea for that? please suggest me.

 

Captcha can't stop full spam. Use some special modules like stop forum spam etc.

 

its preventing spam this time but i just want to know that does it harm to generic members for posting or not?

 

I wouldn't use a forum that has Captcha if I already registered. that's the whole point of registering.

 

It is not a good idea to use Captcha for current members when creating new posts. You need to stop spam bots at the registration level. Captcha does not work well anymore for that job. You should have the following security measures instead:

1. Email Verification - Make new members activate their account before they have the ability to post messages. This is probably the best way to prevent spammers.

2. Security Question/Human Verification - Create a question on your registration page that requires human thinking. For example, create a question, "What is 2+2?". The obvious answer is 4, so potential users will write "4" in the text box. Spam bots cannot answer even these simple questions, so it is a good defense against them. It is better than Captcha and is more effective. I switched my verification method to this from Captcha, and have yet to see a single spam bot account register.

There is no reason to require members to pass verification to post messages. Your problem is that bots are registering. If you allow guests to post messages, I suggest you do not allow that, or possibly make only guests pass a security verification question like I talked about above when they try to create a post.

Most forum platforms have plugins that allow you to create a human verification question on the registration page. Vanilla Forums and SMF I know support this feature, so I am sure it is available for all other forums.

If you want to read more about forum security, I suggest this you read some of my articles here: http://www.forummechanics.com/security/

 

thanks for your suggestion. actually i made it for first post only for members.

 

You should implement the captcha for only new users because it's annoying to fill a captcha every time a user tries to post. There are some plugins that only require captcha for the very first posts. And as mentioned above, when combined with other plugins and services such as StopForumSpam it will be really effective.

 

As said above, you can only apply the captchas to certain groups i.e., the New Forum Members.