X.400
X.400
olemus
elektronposti ITU standardite sari:
põhineb OSI mudelil,
on SMTP alternatiiv sõjalistes jt erirakendustes
ülevaateid
https://www.techopedia.com/definition/5792/x400
https://en.wikipedia.org/wiki/X.400
http://www.ittoday.info/AIMS/DCM/52-30-01.PDF
http://pubs.opengroup.org/onlinepubs/9693999099/toc.pdf
https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-F.400-199906-I!!PDF-E&type=items
turvalisus
https://apps.dtic.mil/dtic/tr/fulltext/u2/a273358.pdf
https://www.kb.cert.org/vuls/id/927278