Not necessarily, if the messages are analyzed there's usually an intent (solicitation, scam, etc.) so you can filter based on the content similar to email. The

Not necessarily, if the messages are analyzed there's usually an intent (solicitation, scam, etc.) so you can filter based on the content similar to email. The shorter lead forms without a message to analyze are a bit different since you can only go based on IP, email, phone but it's possible.