This script was called by a Procmail rule in order to forward specific messages to another mail address, using GnuPG encryption.

forward-gpgified-mail

#! /bin/bash

cleartext="$(mktemp)"
FINALADDR="[email protected]"
TXTINTRO="$HOME/.etc/introduction_forward-me-gpgified"

if [[ "x$cleartext" = "x" ]]; then
    exit 1
fi

### ALWAYS wipe the $TMP
trap "wipe -qsf -- $cleartext" TERM QUIT EXIT

mime-construct --part-header 'Content-Disposition: inline' --type 'message/rfc822' --file - --subpart --output > "$cleartext"

gpg -r "$FINALADDR" --encrypt < "$cleartext" | mime-construct --multipart     \
                    'multipart/encrypted; protocol="application/pgp-encrypted"' \
      --type 'application/pgp-encrypted' --file "$TXTINTRO" \
      --type 'application/octet-stream' --file -            \
      --to "$FINALADDR" --subject "$RANDOM"