During the enrichment process in Surfe and Lighthouse, we always use the Surfe enrichment cascade to find the best valid results. This means we will display only valid emails and invalid emails will not be sent to your list. Learn more about the enrichment and all providers here.

At the moment, it's not possible with Lighthouse to build your own cascade and add more providers. However, Surfe is using one of the best email and mobile providers. You can read more about it here.