Classification Management Training Aid 2.5
Basic Marking Requirements for E
-
Mails
32 CFR Part 2001, “Classified National Security Information”
§2001.23(a), Classification marking in the electronic environment, states:
General. Classified national security information in the electronic environment shall be:
(1) Subject to all requirements of the Order.
(2) Marked with proper classification markings to the extend that such marking is practical, including portion marking, over
all
classification,
“Classified by,” “Derived from,” “Reason” for classification (originally classified information only), and “Declassify On.”
§2001.23(b), Marking on classified e
-mail messages, states:
(1)
E- mail transmitted on or prepared for transmission on classified systems or networks shall be configured to display the overall
c
lassification
at the top and bottom of the body of each message. The overall classification marking string for the e
-mail shall reflect the c
lassification of
the header and body of the message. This includes the subject line, the text of the e
-mail, a classified signature block , atta
chments,
included messages, and any other information conveyed in the body of the e
-mail.
(2)
Classified e
-mai
l shall be portion marked. Each portion shall be marked to reflect the highest level of information contained in that portion.
(3)
A classified signature block shall be marked to reflect the highest classification level markings of the information containe
d i
n the
signature
block itself. (NOTE: most signature blocks are unclassified.)
(4)
Subject lines shall be portion marked to reflect the sensitivity of the information in the subject line itself and shall not
ref
l
ect any
classification markings for the e
-mail content or attachments. Subject lines and titles shall be portion marked before the subj
ect or title.
(5)
For a classified e
-mai
l, the classification authority block shall be placed after the signature block, but before the overall cl
assification
marking string at the end of the e
-mail.
(6)
When forwarding or replying to an e
-mai
l, individuals shall ensure that, in addition to the markings required for the content of
the reply or
forward e
-mail itself, the markings shall reflect the overall classification and declassification instructions for the entire st
ring of e
-mails and
attachments. This will include any newly drafted material, material received from previous senders, and any attachment