I did a test with non existing emails and I got "Good" status. Why?
Note that the Advanced Email Verifier (just like any other email verifying program) can determine up to 70-90% of bad addresses. To verify an email address, the program connects to the recipient's mail server, and imitates sending a message. When the server gives a response that the appropriate email address is good or bad, the AEV disconnects from the server and marks the email address accordingly.
But 10-30% of email addresses cannot be checked without sending a real message to them. You will always get the emails from these domains (be they valid, invalid, or fake) flagged as Good because the appropriate SMTP server receives all the emails for all users. AEV that imitates sending a message "thinks" that the email address is valid, disconnects from the server and marks this email as OK. Thus, all the addresses from such domains can be verified only after sending a message. If the message bounces, the address is not valid.