SESC is configured to submit spam email submissions through a moderator. The moderator is submitting the spam submissions to Symantec by putting the email into the spam submission folder. SESC then submits the spam submissions to Symantec and the spam emails are removed from the spam submissions folder.
However the spam submissions are not processed by the Symantec backend and they are not integrated into the spam rules.
The moderated spam submissions are missing required email headers.
Upgrade to SESC 1.0.1.