User-agent: Yandex

Crawl-delay: 30 
Disallow: /img/ #this is url for captcha

Disallow: /mail/

Disallow: /style/
Disallow: /moderator/

User-agent: Googlebot

Crawl-delay: 40 Disallow: /img/ #this is url for captcha

Disallow: /mail/

Disallow: /style/
Disallow: /moderator/

User-agent: StackRambler

Crawl-delay: 50 
Disallow: /img/ #this is url for captcha

Disallow: /mail/

Disallow: /style/
Disallow: /moderator/

User-agent: Yahoo! Slurp
Disallow: /

User-agent: msnbot
Disallow: /