LUCY allows you to test email delivery prior to run your campaign. This test can be found in the navigation tab under support/test-email:

As a sender you can put any mail address you want. But make sure the mail sender address is not protected (e.g. a SPF entry pointing to a different mail server): a mail sender address like "test@microsoft.com" will not work as it will be filtered by Spam filters. We recommend using a mail sender domain that actually points to LUCY (you can register a domain). As an alternative you can use a domain that exists, but is not protected (you could use "test@gaga.com" for example).