#!/bin/sh

GREP="/usr/bin/grep"
SED="/usr/bin/sed"
SORT="/usr/bin/sort"
AWK="/usr/bin/awk"
ECHO="/bin/echo"
WHOIS="/usr/bin/whois"
SLEEP="/bin/sleep"
EXIM="/usr/local/exim/exim"
SERVERNAME="mail.llorien.org"
HOST="/usr/sbin/host"

$GREP "<>" /var/log/exim/rejectlog.01 | $GREP "sender verify fail" | $GREP -vi Account | $GREP -vi Unavailable | $GREP -vi "valid mailbox" | $GREP -vi $SERVERNAME | $GREP -vi "no such user" |
$SED 's/[^@]*@//;s/>://' |
$SORT -u |
while read domain rest
do
	$HOST -t txt $domain.dsn.rfc-ignorant.org > /dev/null ||
	(
		$ECHO "From: llorien rfc-ignorant robot <rfcibot@llorien.org>"
		$ECHO "To: submit-dsn@rfc-ignorant.org"
		$ECHO "CC: postmaster@$domain"
		$ECHO "Subject: $domain"
		$ECHO
		$ECHO "Dear postmaster,"
		$ECHO "At least one mail server for the domain $domain"
		$ECHO "refuses mail with an empty Reverse-Path. This is a bad idea, as it"
		$ECHO "prevents your users from being notified of mail delivery problems,"
		$ECHO "it's very annoying to other postmasters and violates relevant standards."
		$ECHO "Please see <URI:http://www.rfc-ignorant.org/policy-dsn.php> for details."
		$ECHO
		$ECHO "Notes:"
		$ECHO "-    This mail is sent from an unattended mailbox, do not attempt to reply."
		$ECHO "     Please contact postmaster in case of trouble with this program."
		$ECHO "-    After correction, you may have to remove your domain from the listing at"
		$ECHO "     http://www.rfc-ignorant.org/tools/lookup.php?domain=$domain"
		$ECHO
		$ECHO "domain: $domain"
		$ECHO

		$ECHO "MX Record(s):"
		$HOST -t mx $domain
		$ECHO
		$ECHO "Response from remote server:"
		$ECHO "$rest"
		$ECHO

		$ECHO "MX tracing:"
		$HOST -t mx secureserver.net | $AWK '{print $7}' | $SED 's/\.$//' | $SORT -u |
			while read mx
				do $HOST -t A $mx
			done
		$ECHO
		$ECHO
		$ECHO
		$ECHO "Additional info:"
		$WHOIS $domain | $GREP "[:\@]" | $GREP -vi "terms of" | $GREP -vi notice | $GREP -vi "transmission of" | $GREP -vi "http:"
		$ECHO
	) | (
		$EXIM -t -f "<rfcibot@llorien.org>"
		)
	$SLEEP 5
done