#!/bin/sh

LOG_DIR=/var/log
TAC="tail -r"

usage()
{
    cat <<EOF >&2
usage: $(basename $0) [-r] [-p]

options:
  -r   output lines in reverse order
  -p   view output with pager
EOF
    exit 1
}

while getopts ":rp" c
do
    case "$c" in
    r)      r_flag=1;;
    p)      p_flag=1;;
    :|'?')  usage;;
    esac
done

cmd='(for f in $(ls -r ${LOG_DIR}/maillog*); do
    case "$f" in
    *.gz) zcat "$f";;
    *)    cat "$f";;
    esac
done)'
[ -n "$r_flag" ] && cmd="$cmd | $TAC"
cmd="$cmd | sed -n \
   -e '/reject=.*njabl\.org/p' \
   -e '/reject=.*bl\.spamcop\.net/p' \
   -e '/reject=.*relays\.ordb\.org/p' \
   -e '/reject=.*proxies\.blackholes\.easynet\.nl/p' \
   -e '/reject=.*rfc-ignorant\.org/p' \
   -e '/reject=.*mail from spammers/p' \
   -e '/reject=.*Relaying denied/p'"
[ -n "$p_flag" ] && cmd="$cmd | ${PAGER:-more}"

eval "$cmd"
.