Many website owners discover that their forms are being used to send spam. This is common because forms are often read by a real person, which makes them attractive to spammers.
One of the easiest protections is to add a CAPTCHA or similar verification challenge.
Why it helps
- it blocks many automated submissions
- it reduces junk mail in contact forms
- it lowers abuse of quote, support, or signup forms
Other good practices
- validate form fields on the server side
- limit repeated submissions
- use honeypot fields or bot protection services
- keep form plugins updated
CAPTCHA is not the only defense, but it is often the fastest improvement you can make.