How do I enable debug mode on a Zimbra server for vulnerability research?

To enable debug mode, stop Zimbra with `zmcontrol stop`, back up and replace `/opt/zimbra/libexec/zmmailboxdmgr` with the unrestricted version, then add JDWP options to `mailboxd_java_options` via `zmlocalconfig`, disable the firewall, and restart. This sets up a JDWP socket on port 8000 for remote debugging. For full details, see Setting up Zimbra Vulnerability Debugging Environment.