I got a message form Firefox about this subject. It offers a check to see if your email has been breached . I entered my email but no result was returned .
Additional System Details
- User Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 12_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.2 Mobile/15E148 Safari/604.1
It could be a phishing mail, too.
Could you share more details on the url?