After verification, an email address gets one of three statuses. These are:
Valid email address (that means that the email is correct and exists)
Catch-all email address (the email has an uncertain status, as we cannot identify whether it is abandoned or non-existent).
Invalid (the email address does not exist or is not active anymore)
Before verification, the email address has this icon indicating its Unverified status.
Sometimes there are prospects with personal information such as a photo or work experience etc, however, there is no email address. Such prospects are marked with this icon meaning “Can’t find email”.