Hi @wayne2 ,
Welcome to the Auth0 Community!
If I understand correctly, you want to use the User Import/Export extension to migrate users.
To hold off sending the email notification, I suggest you check out this article. It explains using the verify_email: false flag to prevent verification emails from being automatically sent out. All you need to do is add this flag for all users in the import file.
In case you have questions about how to use this extension, I suggest you check out this article.
Hope this help!