Exporting Leads not possible

In the Copper Application I am the Owner of the Company. Therefore I should have all Permissions. As of now, neither I, nor anyone else is able to export ANY Data from Copper. When I press the button to get the List of Information, the field at the bottom of the page appears where it says, that I will get a Mail with the Data. But no Mail ever arrives. The Problem is not in my mails, as they work perfectly fine and there is also nothing in the spam.