The email addresses returned can have two different states:
All the email addresses found in the Domain Search have public sources on the web. The sources are always displayed in the results, along with their discovery dates.
To find the email address from a name, you can use the Email Finder.
When logged in, a Domain Search that returns at least one email address costs one request. One more request is counted every 10 email addresses returned. For example, to see all the 43 email addresses of a domain name, it will cost 5 requests.
With a free account, you can use up to 50 searches/month. If you need more, please check the pricing for more information.