The emails are partially verified in that we check them for the right syntax, that they're formatted correctly, that they aren't any known honeypots/spamtraps and then that the domain exists and has a server accepting email. We have large blacklists we run the emails against to ensure better quality too.

The only check we don't perform is if the user exists at the domain as this would vastly increase the cost of these lists to you without giving much benefit. If you wish to perform this last check and have a 100% valid list, you can use a variety of tools such as Debounce - however try with and without and see if the cost really is justified and you'll usually find it isn't needed.
Was this article helpful?
Cancel
Thank you!