Which method is recommended to prevent spam cases from being created through web-to-case?

Implementing reCAPTCHA verification is a highly recommended method for preventing spam cases from being created through web-to-case in Salesforce. This approach involves adding a challenge-response test to the web form where users submit their cases. reCAPTCHA ensures that the submissions are made by humans rather than automated bots, which are often used to generate spam. By filtering out automated submissions, organizations can significantly reduce the volume of irrelevant or unwanted cases, allowing customer service teams to focus on genuine inquiries.

While validation rules, limiting case fields, and creating custom case types can help manage case submission in different ways, they are not specifically designed to address spam submissions. Validation rules deal more with ensuring that the submitted information meets certain requirements, which does not inherently stop spam. Limiting case fields restricts the amount of information collected but doesn’t provide any protection against bots submitting the form. Creating custom case types may help in organizing cases better but does not inherently prevent spam activity. Therefore, using reCAPTCHA is the most effective method specifically aimed at stopping spam cases from being submitted via the web-to-case functionality.