Sample Bussiness Case (Federal IT)
1. DNSSEC Mandate: https://georgewbush-whitehouse.archives.gov/omb/memoranda/fy2008/m08-23.pdf
2. DNSSEC status: https://csrc.nist.gov/CSRC/media/Events/ISPAB-NOVEMBER-2010-MEETING/documents/Montgomery-Rose_DNSSec_ISPAB-Nov2010.pdf
3. Worldwide deployment: https://rick.eng.br/dnssecstat/
4. NIST on SMIME and DNSSEC: https://www.nccoe.nist.gov/publication/1800-6/VolC/index.html
5. ES2ES =>  Enable above for Microsoft Outlook