how to stop bots ?

how bots pass captcha security code and confirm email ! ?

this is impossible even to intelligence people i know lol ...

however...

"DNS Blocklist" can prevent this? 

I have zero spam and I don't use captcha.I have a 2 page form and I ask 2 maths questions which interact. For example... "What's 2 plus six?" Then "now add four".

I think recaptcha has gone beyond the point of blocking spam and is now a barrier to humans. With at least half the distorted words being unreadable by humans and the refresh button not being prominent enough. Imo it's no longer viable.

Just let people answer a simple math question and set your system to moderated. That should stop them.

i understand now that captcha is breakable and math captcha is better.

this math captcha is plugin ?

"DNS Blocklist" can block bots as good as the math captcha ?

There are also options in the market as well if you do not want to complicate your join form. Such as this. http://www.boonex.com/m/dolphin-anti-spam

There is a mod developer that has come up with some very clever replacements for captcha, such as finishing a game of noughts and crosses/tic-tat-toe