Email Protective Marking Standard for the Australian Government

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MIMEMTAMUAProtectivemarkingRelayRFCSecurityClassificationSMTPSMTP ClientSMTP Servernetworks and services - see http://www.itu.org/Multipurpose Internet Mail Extensions - IETF standard foremail content allowing multiple types of objects to be includedas part of text data message.Mail Transfer Agent - a host that acts as an SMTP server andclient and therefore provides a mail transport service.Mail User Agent – Normally thought of as the sources andtargets of mail. At the source, an MUA might collect mail to betransmitted from a user and hand it off to an MTA; the final(“delivery”) MTA would be thought of as handing the mail offto an MUA.The combined set of classifications, DLMs, caveats and otherindicators applied to information to indicate the level ofprotection that should be applied over the information'slifetime.An MTA system that receives mail from an SMTP client andtransmits it, without modification to the message data otherthan adding trace information, to another SMTP server forfurther relaying or for delivery.Request for Comments – The official publication channel forInternet standards documents and other publications of theInternet community.A protective marking to indicate official information whichrequires increased security to protect its confidentiality. Eachsecurity classification has specific handling guidance in thePSPF, while the ISM provides guidance on the ICT controls forprotection of such information.Simple Mail Transfer Protocol - Internet email deliveryprotocol as defined in RFC2821 [9].The sender of an email message (a.k.a. SMTP Sender).The recipient of an email message (a.k.a. SMTP Receiver).24
5. Appendix AA5.1 Change LogThis is a log of changes that occur in the Standard from version to version. Readers who areconversant with a previous version of the Standard can use this change log to understand whatimportant changes have been made to the newer version of the Standard.Changes from 2012.2Clarified relationship between security classification and email specific markings andDLMs Changed country code character from ‘2’ to ‘3’.Revised coding error in relation to DLM literals.Changes from 2012.1Allow choice of security classification, dissemination limiting marker, or combination ofboth.Introduced the abbreviated caveat type markings of C, SC, RI and SH so that the protectivemarking also conveys information about the type of caveat to simplify interpretation byemail gateways and clients.Allowed for use of multiple country codes in ReleasabilityIndicator where they areseparated by forward slash character (backslash character reserved as escape characterdelimiter).Clarified style for Security Classifications and DLMs.Changes from 2011.1Cleaned up syntax around caveats.Proposal for UNCLASSIFIEDProposal for multiple DLMs and their position Proposal for use of ISO 3166-alpha 3.Proposal for treatment of markings in subject line.Clarified source of authority for markings.On advice from Attorney-General’s Department, changed case of DLM caveats to propercase.25
Page 1 and 2: Email Protective Marking Standardfo
Page 3 and 4: AbstractThis Standard defines the f
Page 5 and 6: Changes from Version 1.0 26Changes
Page 7 and 8: 1.2 AudienceThis Standard is intend
Page 9 and 10: 2.4 NamespaceThe protective marking
Page 11 and 12: 2.10 Regular Expression DefinitionT
Page 13 and 14: Values for DLMs that may be conditi
Page 15 and 16: NS appears in the Internet Message
Page 17 and 18: 2.11.1 Base tokenscomma-FWS = "," F
Page 19 and 20: 2.11.6 Caveat rulescaveat-tag = %d6
Page 21 and 22: 2.11.13 Version rulesversion-tag =
Page 23: 4. GlossaryThese definitions have b
Page 27 and 28: Changes from 2005.3Specified Intern
Page 29 and 30: 6. Appendix B6.1 ExamplesFor the sa
Page 32: A message containing SECRET informa

Email Protective Marking Standard for the Australian Government

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