Now fix for real the mail loss on spam filtering. The previous fix's idea was...

Now fix for real the mail loss on spam filtering. The previous fix's idea was good, just that unfortunately the default value is "setCacheOnly(true)" set in AgentBasePrivate, so we have to explicitely set the cacheonly to false, otherwise mail content is not fetched from the mail server when passing through a filter that *needs* a content.

FIXED-IN: 4.9.1

BUG: 295484
(cherry picked from commit c691cb5d)