Received an email which was obviously a spam and most likely from someone's hacked account. It showed however a smartermail spam of 0 as a Trusted Sender. I checked the server's logs and it shows spam skipped because it was a Trusted Sender (user level).
Checked my whitelist and neither the full sender nor the domain (bellsouth.net) was listed.
Any ideas how such would become a false "trusted sender"?