Yes, you can use different accounts to send your campaigns. You can create a new account by moving the mouse cursor on the “tools” symbol, which you can find at the top right of the page. After that, go to "Submission Accounts," then click on the button "New Account" in the upper left corner of the page. Please note that if you use a different (new) email address, you will need to configure the Sender ID as well as DomainKey with DNS on the server.