The Federal Government must encrypt email in transport and, where practical, use end-to-end encryption; within 120 days, each FCEB agency technically enforces encrypted and authenticated transport for all connections between its email clients and their associated email servers.
This control maps to 2 controls across 2 other frameworks. If you already hold one of them, the evidence you collected for it is the starting point here rather than new work.
Every mapping shown was judged rather than inferred from wording similarity, and the ones that failed review are published too. See the coverage reports and what was rejected.
The graph holds this control, the 2 it maps to, and the evidence behind each claim, over MCP and REST.