I got an email from "Citadel Holdings & Consultant Inc", is it a scam?

There are many similar scams out there. No legitimate company would email a stranger to offer them a job, and no legitimate company would use homeworkers to process payments. How the scam works is that they will ask you to cash or deposit these fraudulent checks or money orders using your personal bank account and then transfer the funds to them. So you send them the money, and eventually the checks bounce and you are held accountable for cashing bad checks. Do not give any information to your company and do not respond to any solicitations like this that you may receive.