JACKSONVILLE, Fla.—While most emails are legit, some are scams and others are death threats which makes Cyber Security your concern.

Tuesday Kimberly - last name withheld - received an email that scared her.

"I started shaking and I said what is this and I continued to shake and started crying," she said.

She's still too terrified to talk about it. She doesn't know the sender but opened it nevertheless and it contained very threatening language. It was a death threat email.

It read in part:

This is how your life is going to end. My duty as I am mailing you now is just to kill you and I have to do it as I have already been paid.

"Terrifying experience. Not what I was expecting my night to turn out like," said Kimberly. "Shaky when you are a single mom."

She doesn't know who is behind it but the email claims she may know the person or persons involved.

It reads:

Someone you call a friend wants you dead by all means and the person has spent a lot of money on this.

"Why me?" asked Kimberly.

A Google search revealed this has happened before across the country, and the email usually demands money from the recipient. It didn't in her case. But it ended on a grim note:

We are monitoring you. Do not think of contacting the police.

But she did and said her confidence is restored.

Clay County Sheriff's White Collar Unit calls it an active investigation. Investigators said this appear to be a well known international scam and while it did not demand money, investigators suspect there will be a subsequent email demanding money.

If you have a problem, you should file a complaint with this website.

Cyber Security is a shared responsibility.