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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# This generates lore-friendly message-id headers that are safe, unique, and
# provide better UX for someone using lore to retrieve messages.
#
# Instructions for using with mutt/neomutt:
#
# Save this as ~/bin/my-gen-msgid, then add ~/.mutt-fix-msgid with the following,
# fixing your path to the file:
#
# my_hdr Message-ID: <`/home/user/bin/my-gen-msgid`>
#
# then edit ~/.muttrc to add:
#
# send-hook . "source ~/.mutt-fix-msgid"
#
# I like my msgid to start with the date
msgid="$(date +%Y%m%d%S)-"
if [[ -x /bin/diceware ]]; then
# I like memorable nonsense, so I can visually tell one message from another,
# by looking at the lore URL, so use diceware for that
msgid="${msgid}$(diceware --no-caps -d- -n2)-$(openssl rand -hex 2)"
else
# Just use openssl with some extra randomness
msgid="${msgid}$(openssl rand -hex 12)"
fi
# Don't leak my hostname, just use something that makes sense to me
echo -n "${msgid}@gregkh"
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