Hello,
As far as it is possible i will always select forward mode :
- less traffic to manage on mail gateway plugged to DLP (in reflect mode it will receive twice initial amount of traffic)
- Easier to manage (and to debug)
simplest way to do it is to plugged you rmail system to DLP (exchange / lotus / ....) then forward message to Symantec SMG in order to manage usual SMG actions and may be to manage also emails which was tagged to be blocked by DLP.
regards