Botnet Analysis
If botnet analysis is enabled, DNS validation is performed on the first untrusted relay looking for signs of a potential botnet infected host. For example, no reverse DNS, a hostname that would indicate an ISP client or other hosts that aren't intended to be acting as a direct mail submitter outside of their own domain.
Go to Anti-Spam Engine > Settings > Botnet Analysis to enable or disable botnet analysis.
![STG-botnet-analysis.jpg](image/uuid-4fc6bc29-23f2-a888-c597-222423cda9e3.jpg)