Hello,
7 to 8 mail per second looks really slow. Does this slow processing happens recently or was it always like that ?
May you have some other issue than just fine tuning DLP communication. Usually DLP latency comes from (depending also on your DLP version) :
- Prevent server ressource limitation (CPU, memory or disk)
- Policies with "too many" exceptions (unfortunately DLP dont like that)
- Policy rules using too many complex regex
Regards.