The Email Track & Trace is a powerful tool for tracing specific emails and determining if and when they were processed and if any actions were taken by the Symantec services on them. The following best practices will help you optimize your searches.
Limiting the time window and refining your search criteria will yield the best results.
When do I ask for results in the UI versus asking for a CSV to email results?
How long should a report take?
What causes timeouts and failed searches?