I have recently test MEG in transparent bridge mode. It works perfectly fine until I found out that it is causing conflict to our network and started everything to slow down. I deployed MEG as shown below.
I configured it using the instruction I found on YouTube How to install and configure McAfee Email Gateway (MEG) - YouTube but instead of Explicit Proxy I used Transparent Bridge.
I don't know what the problem is so I disconnect MEG as of the moment. Did I missed anything with the configuration?
What sort of conflict is it causing? If you haven't already, I would recommend contacting Support for assistance with setting up the MEG.