I made something like this a while back, but after some research I found that it's illegal to send unsolicited emails and you could be fined by the FTC. Correct

I made something like this a while back, but after some research I found that it's illegal to send unsolicited emails and you could be fined by the FTC. Correct me if I'm wrong, but I think it's ok to open source the code so people can use it at their own discretion, but making it into an actual product would run into legal troubles?