Exim Filter for Australian Government protective marking expansion

protective-marking.filter

# Exim filter

# Only run this on the first pass through the filter
if not first_delivery then
        finish
endif

# Trap any errors
if error_message then
        finish
endif

# Expand Email Protective Marking shortcuts
if "$h_subject:" ends " mmuo"
then
	headers add "Expanded-Subject: ${sg{$h_subject:}{ mmuo\\$}{ [SEC=UNOFFICIAL]}}"
	headers remove subject
	headers add "Subject: $h_expanded-subject:"
	headers remove expanded-subject
	headers add "X-Protective-Marking: VER=2012.3, NS=gov.au, SEC=UNOFFICIAL, ORIGIN=$sender_address"
elif "$h_subject:" ends " mmuc"
then
	headers add "Expanded-Subject: ${sg{$h_subject:}{ mmuc\\$}{ [SEC=UNCLASSIFIED]}}"
	headers remove subject
	headers add "Subject: $h_expanded-subject:"
	headers remove expanded-subject
	headers add "X-Protective-Marking: VER=2012.3, NS=gov.au, SEC=UNCLASSIFIED, ORIGIN=$sender_address"
elif "$h_subject:" ends " mmfo"
then
	headers add "Expanded-Subject: ${sg{$h_subject:}{ mmfo\\$}{ [DLM=For-Official-Use-Only]}}"
	headers remove subject
	headers add "Subject: $h_expanded-subject:"
	headers remove expanded-subject
	headers add "X-Protective-Marking: VER=2012.3, NS=gov.au, DLM=For-Official-Use-Only, ORIGIN=$sender_address"
elif "$h_subject:" ends " mmse"
then
	headers add "Expanded-Subject: ${sg{$h_subject:}{ mmse\\$}{ [DLM=Sensitive]}}"
	headers remove subject
	headers add "Subject: $h_expanded-subject:"
	headers remove expanded-subject
	headers add "X-Protective-Marking: VER=2012.3, NS=gov.au, DLM=Sensitive, ORIGIN=$sender_address"
elif "$h_subject:" ends " mmsp"
then
	headers add "Expanded-Subject: ${sg{$h_subject:}{ mmsp\\$}{ [DLM=Sensitive:Personal]}}"
	headers remove subject
	headers add "Subject: $h_expanded-subject:"
	headers remove expanded-subject
	headers add "X-Protective-Marking: VER=2012.3, NS=gov.au, DLM=Sensitive:Personal, ORIGIN=$sender_address"
elif "$h_subject:" ends " mmsl"
then
	headers add "Expanded-Subject: ${sg{$h_subject:}{ mmsl\\$}{ [DLM=Sensitive:Legal]}}"
	headers remove subject
	headers add "Subject: $h_expanded-subject:"
	headers remove expanded-subject
	headers add "X-Protective-Marking: VER=2012.3, NS=gov.au, DLM=Sensitive:Legal, ORIGIN=$sender_address"