How to protect Contact Form from spam?

You can use several approaches to protect it:

1. As I said before, you can configure bot profile, to protect you application from bots.
2. You can define appropriate parameter "name" in policy with some restrictions, like "Email" data type or aplha-numeric data type with maximum length (e.g. 50 characters) or with some regex rule or with some disallowed metacharacters
3. You can create special valuecontent signature with special rule, which will match bad pattern

Thanks, Ivan