LeadIQ does offer the feature of being able to upload a list of leads and have us verify the emails for you.
That's under Upload > List of Leads at the top of the LeadIQ web app.
You can upload a .csv with the first 4 columns being First Name, Last Name, Company, and Email.
We'll do our verification step on the emails but will not add any new email addresses for the individuals. Instead, if you want new emails for those people, just leave that Email column out entirely and we'll provide them.
If you have any trouble, please contact our Support team by clicking "Submit a request" at the top right of this page for further assistance.