The colours 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 showed as a percentage. 

Emails with a 95% Confidence Score or higher have a high chance of being deliverable. The green dot is provided for emails that are most likely to be deliverable.

The yellow dot is associated with emails that are risky:

The red dot, on the other hand is assigned to emails with a low confidence score and that are most likely undeliverable:

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