X.400

wikipedia:X.400

http://searchexchange.techtarget.com/definition/X400
ヽ(；´Д｀)ﾉ

http://www.wdic.org/w/WDIC/X.400

Anatomy of a Mail Address

http://www.remote.org/jochen/mail/info/address.html

霞ヶ関WAN

http://www.wdic.org/w/WDIC/%e9%9c%9e%e3%83%b6%e9%96%a2WAN

各府省情報化統括責任者（ＣＩＯ）連絡会議(第13回)資料
http://www.kantei.go.jp/jp/singi/it2/cio/dai13/13gijisidai.html