Army Regulation 25-2, Information A

Army Regulation 25-2, Information Assurance :
“f. E-mail security. All personnel will use e-mail systems for transmission of communications equivalent to or less than the classification level of the IS.
(5) All personnel will employ Government owned or provided e-mail systems or devices for official communications.
(6) The use of commercial ISP or e-mail accounts for official purposes is prohibited.”