When you say emailing you here. Do you mean emiling you at your personal email address? or emailing here at CC? either way I would not try to contact this person. As this is maybe what he wants. People will just make account on social websites, even go to make a false email account to get people's attention, to write to them, they will try to take you away from the site you met them just to talk to you, well why go else were if you can talk were you at? But this is what the internet has become. Much falsness and people will try to con you, decieve you, lie to you, pretend to you, just to try to manipulate you and troll you, ruin you and be careless. Not to mention the viruses and they could be selling your information. Sounds weird I know, but as you know I'm sure,, that there are those who go round gathering information and will sell it you secret agencies and even goverments. Sad but true.
People needs to read the rules of this site, I know many will not, and think they can cope with trollers, decievers, then they end up asking for advice because of what these idiots done to them.
If that Mario person is bugging you, all you can do is to ignore that person, dont be tempted to talk to him, he obviously has a goal in his life to disrupt or to manipulate you mess you around. We here on cc, are constantly telling people not to give out any information regarding emails, facebook, chats and messengers. But they continue to ignore. and then they get all this problem that they asking to help with. But if you are having problems with anyone on CC. you can always message RoboOP or any of the mods and they will help all they can. But all I can is to don't trust everyone. Sorry to sound harsh, we all want to trust someone even friends, But even friends cant be trusted. Shame but there you go. Thats life.
Just be careful in future not to share contact details even if you are feeling that you can trust them. Better to be safe than sorry. all you can do is to make a new email account. and be careful who you share it with.