batch of domains, and forming part of this very long running scam, the domain us-newcareer.com was freshly registered two days ago.
The jobs offered by anyone soliciting replies to this email address are all criminal activities and should be avoided. The spam email messages may appear to be coming from your own email address, but this is a simple forgery and it does not mean that your computer or mail account is compromised.
If you have examples of spam emails using the domain, please consider sharing them in the Comments. Thanks!