Same old, same old : i have infected all your devices, you have been watching porn, you're a naughty boy, don't contact the police, blah blah blah...
There was no attached file, simply the mail...
The worst thing that can happen is that you run into some ransomware that encrypts all your files and you have to pay a fee for them to be unlocked. If that was the case, you would know about it. Your devices aren't infected, it's just scare tactics. Unless you downloaded something before you received the email that could have infected you, there is nothing to worry about. You can ask the scammer if he can recommend some good porn sites based on the content he knows you have watched so far
anyway, when you say "signal" do you mean trace who it is belonged to?
He probably meant that he wanted to report it to someone. As SFR10 mentioned earlier, that address has already been reported multiple times for fraudulent activities. That's all you can do about it.