From 9605b5c226015990295ddfc0ac1dcad217ef9291 Mon Sep 17 00:00:00 2001
From: "martin f. krafft" <madduck@madduck.net>
Date: Tue, 15 Jun 2010 11:49:48 +0200
Subject: [PATCH] store sha256sums instead of plain addresses for privacy
 reasons

---
 .mutt/ack-recipients                   | 13 +++++++++++++
 .mutt/sendmail-checks.d/ack-recipients | 14 ++++++++++++--
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/.mutt/ack-recipients b/.mutt/ack-recipients
index e69de29..29cd937 100644
--- a/.mutt/ack-recipients
+++ b/.mutt/ack-recipients
@@ -0,0 +1,13 @@
+# ~/.mutt/ack-recipients
+#
+# This file stores sha256sums of lower-cased e-mail addresses (no newline)
+# instead of the addresses themselves as a measure to protect privacy. You can
+# get new lines like this:
+#
+#   printf my.new@e-mail.addre.ss | tr [[:upper:]] [[:lower:]] \
+#     | sha256sum | sed -e 's, .*,,'
+#
+8e31c9e140910b4d3a44a014ca968b858f0909d26633a0d0814082381946d596
+af52810da7583e744c8613b34b95c3121c3fdabc4bd0b71618e1b7d250ffd42b
+f3839e4359797b49add476bdda1645441ad453f5fded8ce33afb7e3b7a6e47f8
+4043918375b7455f59c91ee745814fa7c4a793876b6a04a4e44c38dc01cde0d1
diff --git a/.mutt/sendmail-checks.d/ack-recipients b/.mutt/sendmail-checks.d/ack-recipients
index d22eb6b..7edd1d5 100755
--- a/.mutt/sendmail-checks.d/ack-recipients
+++ b/.mutt/sendmail-checks.d/ack-recipients
@@ -6,6 +6,16 @@
 # 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.
 #
+# The file ~/.mutt/ack-recipients stores sha256sums of lower-cased e-mail
+# addresses (no newline) instead of the addresses themselves as a measure to
+# protect privacy. You can get new lines like this:
+#
+#   printf my.new@e-mail.addre.ss | tr [[:upper:]] [[:lower:]] \
+#     | sha256sum | sed -e 's, .*,,'
+#
+# E.g. my address (see below) will become
+#   84d5b33c9376f67274c2ec9ce0e03b6973fb8bc943ebd7abb470c903c47e00f4
+#
 # Copyright © 2010 martin f. krafft <madduck@madduck.net>
 # Released under the terms of the Artistic Licence 2.0
 #
@@ -21,9 +31,9 @@ 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 $r | sed -e 's,\.,\\.,')
+  rs=$(printf $r | tr [[:upper:]] [[:lower:]] | sha256sum)
   # now check if this unacked recipient needs to be acked
-  if [ $ack -eq 0 ] && grep -qi "^${re}$" "$CHECKLIST"; then
+  if [ $ack -eq 0 ] && grep -q "^${rs%% *}$" "$CHECKLIST"; then
     echo >&2 "E: will not send mail until $r has been added to the $HEADER header"
     ret=1
   fi
-- 
2.39.2