SteveM, did you print out the header, for future reference in case you’re contacted by your local police? Also, what other info do you have other than the email address from the other person? I was just wondering if you had the other person’s phone number or even a physical address, otherwise the police are just “going to look into it”. There’s not much they can do without it here in the states, & you’re in Canada at that. That might fall under a whole different jurisdiction because of international borders.
For certain types of activity, many states require repeated acts or a pattern of behavior in order for a defendant to be found guilty of harassment. But where the activity involves physical contact, the threat of violence, or conduct likely to provoke a violent reaction, harassment statutes typically require only a single incident. For example, Hawaii’s harassment statute requires repeated phone calls in order for a violation of the law to have occurred, but the same statute requires only a single occurrence if the language or action is likely to cause a violent response or cause the victim to reasonably believe that the aggressor intends to physically harm the victim.

In some states, it is not necessary that a person threatens immediate harm. In Washington state, for example, a person commits harassment even where the threat is to commit a physically violent act at a future time. Other states require an immediate threat, such as California’s criminal threat statute.

Dude probably has a Ring for his doorbell & would be hiding in his Mom’s basement.