Whenever we provide you with a prospect's email address, whether through our Chrome Extension or through importing your own prospects, we give it a certain confidence score.

The Confidence Score is Prospect.io's way to tell you which addresses are certain to exist, which are likely to exist and which will most likely bounce your email back.

The score of your prospect greatly depends on what we are able to find about them, and where you perform the search.

We attribute the score in 2 steps:

Step 1:

We check if the prospect's email is mentioned somewhere on the website.

If the email address is mentioned, it will receive a 100% score and is safe to contact.

Step 2:

If we are not able to find the email address on the website, we will perform a series of checks to guess the right combination of first name, last name, and domain and test them with their server.

Based on the server's response we are going to attribute the score from 0% for emails that don't exist to up to 95% when the server responds positively.

Please note that even though our score is a reliable way to determine the quality of the email address, messages can still bounce as there are more factors that might contribute. For example: recipient's inbox is full and can't receive any more messages at the moment.

Our default Confidence Score is 66% as it provides a reliable quality for your campaigns.

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