Hello, 

I am new to Salesforce development and have a question on Web to Lead.

We have been receiving lot of spam through our Web to Lead form. To tackle this we added some front end validation and also added a trigger to avoid capturing that Lead, in case front end validation fails. Now, we received an email from Salesforce Support that "Salesforce could not create this Lead".

Could you please let me know my best options to avoid saving spam mails into Lead object.

Thank You!