Yes, you can verify your leads as you import them or when they are already in one of your lists of people.
Verify leads when importing them
To verify them when importing, simply check the option before starting the import.
Verify already saved leads
To verify leads you've already saved, go to the Leads section. Check the leads you want to verify; a blue actions menu will pop up; now click on Verify leads.
💡If you're part of a team, only the Team Owner and Admins have the possibility to verify all leads. Should you be a member of a team, by verifying all leads, you will only verify leads that belong to you.
👉 For more details, you can read more about verifying emails in your Leads section in this Leads help article.