It depends on the email checker you have used. Some tools may mark the email status as ‘verified.’ Other tools, like Snov.io, do thorough email verification and validate email address lists whereby each of them receives one of the three statuses: “valid,” “invalid,” or “unverifiable.” A valid email is marked with a green color. If the email is invalid, it is marked with an orange color. If the email is unverifiable (risky), it is marked yellow.