The different colors denote different IP addresses. This helps you quickly identify if an email has been opened up in multiple offices, or multiple times in the same office. It is a visual overview of how much traction your emails are getting.

The different colors denote different IP addresses. This helps you quickly identify if an email has been opened up in multiple offices, or multiple times in the same office. It is a visual overview of how much traction your emails are getting.
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