Apollo only provides guessed emails if we are at least 60% positive that the email will not bounce. This percentage is determined by Apollo's manual verification team.
To see the confidence percentage rating of a contact's email, go to the contact's page and hover your mouse over the email icon.
This shows you how confident Apollo is in the email address.
Please note, you will not be charged an email credit for a guessed email. Only verified emails cost credits.
If you currently have a high bounce rate, do not send guessed emails through your sequences until you repair your reputation with your mailing service. For more on email bounce rates, please refer to the "Why Do I See Such a High Bounce Rate for Emails from Apollo?" article.