In your file you will find mentions:
safe: the email has a 97% deliverability
riskier: the email has an 83% deliverability.
When you export leads from Sales Navigator and check the "Find emails" option, the emails founds are automatically verified.
They are also verified when you use you the Email Finder.
You can also upload a list of emails to verify them directly into the Email Verifier.
What are the techniques used to verify the emails?
Evaboot uses many different techniques to verify the validity of your emails.
SMTP validation: Remove dead, invalid, and unresponsive emails from your list.
MX record check: An MX record check lets us confirm the email is in use and able to accept mail.
Catch-all check: We check against known catch-all email and domain databases.
Domain check: Our algorithm checks whether the email’s domain is real.
Spam traps: Use our smart spam trap indicators to remove honeypots.
Disposable check: We can detect temporary, disposable, and questionable emails.
Syntax check: We check that the email is typed correctly and all symbols are in place.
Graylist-proof: We can verify some of the most hard to check ESP's.
Risk Validation: Get rid of emails containing high-risk keywords and TLDs.