Every now and then you come across a new service that seems highly useful, for me email validation falls into this category.
Not only does it help you to identify business contacts that have moved (email no longer valid), but helps maintain a good quality email mailing list (with only valid emails), keeping you clear of any spam filters.
(Related Post: Why business relationships are so important)
It's worth knowing how the process works, then you'll be able to assess what the results are telling you and what you can expect.
We’ve produced a short video about its importance and a top level view of how it works.
Watch the video, it's only 4 minutes long...