The colors next to each email address indicate our estimation of the probability the email address is actually correct (Confidence Score). You can hover over them to see the exact probability shown as a percentage. 

The green dot is provided for emails that are most likely to be deliverable.

The yellow dot is associated with emails that are risky and may bounce. We recommend verifying those emails with the Email Verifier tool.

Lastly, emails with a red dot are most likely to be undeliverable (they are rarely displayed as we are constantly removing them from the search results).

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