wordpress - Can a captcha attract spam? -


i know email forms can attract spam, can captcha attract spam?

i have wordpress website 19 contact forms (one each company advisor). test, put captcha on 1 of contact forms see if form received less spam other forms.

2 months goes by, no spam @ of 19 forms.

today though, 10 spam messages sent through 1 of forms. odd was form had captcha spam sent though, other 18 forms untouched (and easy find).

any idea why or how have happened, , can prevent happening again?

*edit page captcha/contact form on not indexed (noindex nofollow yoast plugin).

thanks!

my first thought make use of called invisible captcha or honeypot technique. in nutshell, invisible captcha relies on principle bots detect hidden fields , fill in information. human visitor, on contrary, never see them (as hidden css), therefore remain empty. aware of wordpress plugin invisible captcha, works on comments , not seem useful in case. hope of help.


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