"Not emailed” could display for one of these reasons:
The corresponding agent’s search has not run yet.
The corresponding agent’s search does not run automatically.
The corresponding agent’s search is not set up to email matches to clients.
You may use reverse prospecting to individually reach out to agents who have potential clients by using the email button/envelope shown by the agent.
If you are looking at reverse prospecting on a draft, you will only see “not emailed”, as draft listings are never emailed to clients.