Emails

Do not place a disclaimer statement on emails asserting the email "may contain CUI".

Markings are for training use only.

 
Emails containing CUI will contain:
"CUI" as the first and last line of the email
 
CUI designation indicator block
 
Example of markings on an email containing CUI
Emails not containing CUI, but have CUI attachments will contain:
"CUI" as the first and last lines of the email
 
A statement that the email is unclassified when CUI attachments are removed.
 
The CUI designation indicator block is not required on the email.
 
All attachments will be properly marked.
Example of an unclassified email with CUI attachments