If you are seeing Outbound Mail have a high Spam Score, and it is always failing the following two tests:

- BOTNET=3.5

- RDNS_NONE=1.367


there is a good chance that an IPv6 address beginning with fe80:: in one of the "Received:" headers is causing the issue.


To see if that is the issue, add the following to Anti-Spam Engine > Settings > Internal Networks

fe80::/10


If that was the issue, the spam score will be lower those the two tests mentioned earlier will be replaced with:

ALL_TRUSTED=-0.6