Email Protective Marking Standard for the Australian Government

2.11.8 DLM Rulesdlm-value = for-official-use-only / sensitive /sensitive-legal /sensitive-personal /sensitive-cabinetDlm = dlm-tag "=" dlm-value2.11.9 Expiry rulesexpires-tag = %d69.88.80.73.82.69.83 ; EXPIRESexpires-date = full-date ["T" full-time] ; RFC3339expires-event = expires-date / event-descriptionevent-description = one-to-128-safe-textdowngrade-tag = %d68.79.87.78.84.79 ; DOWNTOExpires = expires-tag "=" expires-eventcomma-FWS downgrade-tag "="classification-value2.11.10 Note rulesnote-tag = %d78.79.84.69 ; NOTEnote-value = one-to-128-safe-textnote = note-tag "=" note-value2.11.11 Origin rulesorigin-tag = %d79.82.73.71.73.78 ; ORIGINOrigin = origin-tag "=" simple-email ; example:; ORIGIN=; neville.jones@ato.example.org2.11.12 Namespace rulesnamespace-tag = %d78.83 ; NSnamespace-value = "gov.au" ; case-insensitivenamespace = namespace-tag "=" namespace-value ; NS=gov.au20