You can run multiple organizations with multiple auctions under one email.
Creating a new organization...
click on General Setup
click on Non-Profit Information
click on Add from the top menu to add an organization
Creating a new auction under a specific organization, once you have created the organization ...
confirm you are in the correct organization by checking the top of your auction page. If you are not in the correct organization, click on the Switch Auction button at the top of the page.
click on Auction Setup from the right-side menu
click on Create New Auction
select the organization that you want to add the auction to
Once you have created your new auction you can switch between auctions at the top of your page by clicking on the button at the top of your auction page.
The name of the auction that you are working on will appear at the top of your page. Double-check that you are always working on the correct auction.