I have one client on latest MacOS with latest Outlook and latest SEP unmanaged client. After restarting or closing Outlook, the first time you send a PDF (only PDF) it becomes corrupt to the recipient. Uninstall Symantec and all is good. Reinstall Symantec first PDF email becomes corrupt again. Symantec logs doesn't show that it is blocking anything, but obviously it is doing something.
I have a support case open. I just wanted to see if anyone else has seen something similar.
I have another Mac that is the same setup that has no issues.