From 3c3bc5aeb21f2fafa0736b40282248806ee44a86 Mon Sep 17 00:00:00 2001
From: cmharper <1422608+cmharper@users.noreply.github.com>
Date: Mon, 15 Apr 2019 09:24:03 +0100
Subject: [PATCH] Added decription as to what postfix-mta-sts-resolver does

---
 setup/mail-postfix.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/setup/mail-postfix.sh b/setup/mail-postfix.sh
index 0b3c3f19..f117267f 100755
--- a/setup/mail-postfix.sh
+++ b/setup/mail-postfix.sh
@@ -230,7 +230,9 @@ max_age: 86400
 EOF
 chmod a+r /var/lib/mailinabox/mta-sts.txt
 
-# install the postfix MTA-STS resolver
+# install the postfix MTA-STS resolver.  the MTA-STS resolver service is
+# used by Postfix to ensure outgoing mail uses TLS when the recipient
+# announces MTA-STS.
 hide_output /usr/bin/pip3 install postfix-mta-sts-resolver
 # add a user to use solely for MTA-STS resolution
 id -u mta-sts &>/dev/null || useradd -c "Daemon for MTA-STS policy checks" mta-sts -s /usr/sbin/nologin