The analytic rule identifies hosts that are receiving an unusually high volume of network traffic from email servers, potentially indicating malicious activity such as data exfiltration. It employs the Network_Traffic data model to calculate incoming bytes from email servers, comparing the current traffic against historical averages and standard deviations. This approach allows for the detection of significant deviations that could suggest unauthorized access or data breaches. To implement this search, it's critical that network traffic is properly ingested, and email servers are categorized as "email_server" to ensure accurate functioning of the rule. The parameters like deviation threshold and minimum data samples can be tailored based on specific network traffic characteristics.