From c48af8b004671069fc75f0ed6dcaedfefb5b7c6e Mon Sep 17 00:00:00 2001
From: "martin f. krafft" <madduck@madduck.net>
Date: Mon, 14 Jun 2010 13:40:53 +0200
Subject: [PATCH] implement requirement to ack recipients as a sendmail check

---
 .mutt/ack-recipients                   |  0
 .mutt/sendmail-checks.d/ack-recipients | 41 ++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 .mutt/ack-recipients
 create mode 100755 .mutt/sendmail-checks.d/ack-recipients

diff --git a/.mutt/ack-recipients b/.mutt/ack-recipients
new file mode 100644
index 0000000..e69de29
diff --git a/.mutt/sendmail-checks.d/ack-recipients b/.mutt/sendmail-checks.d/ack-recipients
new file mode 100755
index 0000000..d22eb6b
--- /dev/null
+++ b/.mutt/sendmail-checks.d/ack-recipients
@@ -0,0 +1,41 @@
+#!/bin/sh
+#
+# ack-recipients – require double-checking of some recipients
+#
+# refuse to send a mail as long as recipients listed in ~/.mutt/ack-recipients
+# are not individually "signed-off" by adding their e-mail addresses to the
+# X-Acked header. This header is removed from the mail before it is sent.
+#
+# Copyright © 2010 martin f. krafft <madduck@madduck.net>
+# Released under the terms of the Artistic Licence 2.0
+#
+set -eu
+
+CHECKLIST="$HOME/.mutt/ack-recipients"
+HEADER=X-Acked
+ACKED_RCPTS=$(formail -czx ${HEADER}: < $1 | tr -d ',')
+MAILFILE="$1"; shift
+
+ret=0
+for r in $@; do
+  ack=0
+  # check if this recipient is in the list of acked recipients
+  for a in $ACKED_RCPTS; do [ $a = $r ] && ack=1 && break; done
+  re=$(echo $r | sed -e 's,\.,\\.,')
+  # now check if this unacked recipient needs to be acked
+  if [ $ack -eq 0 ] && grep -qi "^${re}$" "$CHECKLIST"; then
+    echo >&2 "E: will not send mail until $r has been added to the $HEADER header"
+    ret=1
+  fi
+done
+
+[ $ret -eq 0 ] || exit $ret
+
+# now remove the X-Acked header from the mail
+TMPFILE=$(tempfile -p mutt-sendmail -s .msg)
+settrap () { trap "$@" 0 1 2 3 4 5 6 7 8 10 11 12 13 14 15; }
+cleanup () { rm -f "$TMPFILE"; settrap -; }
+settrap cleanup
+formail -I ${HEADER}: < "$MAILFILE" > "$TMPFILE"
+mv "$TMPFILE" "$MAILFILE"
+settrap -
-- 
2.39.2