#! /bin/sh

seen=/tmp/seen$$
new=/tmp/new$$
unseen=/tmp/unseen$$

touch $seen
while true; do
    grep reject /var/log/syslog | grep 'to=<wohler@newt.com>' | \
        sed 's/.*from=<\([^>]*\)>.*/\1/' | sort -u > $new
    comm -13 $seen $new > $unseen
    sort $seen $unseen > $new
    mv $new $seen
    if [ -s $unseen ]; then 
        cat $unseen
    else
        echo -n .
    fi
    sleep 60
done