Radar's Domain Threats tab will alert you to any domain-related security vulnerabilities.
In most phishing attacks, attackers will register domains that look similar to yours, in an attempt to impersonate your brand - these are called Typosquats.
They may then go one step further, and register a TLS certificate against a copycat domain in order to bypass browser security restrictions.
In other circumstances attackers could gain control of a legitimate subdomain still configured to you via DNS records.
For more info on each of these modules and how they can help alert you to a potential phishing attack, check out the guides below.