"Threatening emails" refers to messages sent electronically that contain harmful or intimidating content, intended to cause fear or harm to the recipient. Full definition
Since being home, I have received 2 threatening emails from her attorney. (projectqueen.org)
Timothy Geotz sent threatening email about his stance on whether or not to remove Confederate statue at Mount Hope Cemetery, police say (fios1news.com)
It has been reported that climate scientists have seen an increase of threatening emails since the CRU email leak late last year. (mind.ofdan.ca)