#! /bin/sh

        mid_pattern='postfix\/[a-z]*\[[0-9]*\]: [0-9A-F]*:'
mid_replace_pattern='^.*postfix\/[a-z]*\[[0-9]*\]: \([0-9A-F]*\):.*$'
logfile=/var/log/mail.log*

usage() {
	cat <<EOF
Usage: $0 <pattern>

The pattern given will be grepped through /var/log/mail.log to find messages.
Any line matching the message ID will then be displayed.

The pattern can be a message id, a from, a to, an email address, anything that
appears in a line that might lead to a message id. 

That message ID then used to print the whole log associated with the message
id. If multiple message IDs match, their logs will be displayed one after the
other.

Examples:
  $0 Nov 22 08:19:16
  $0 209.44.112.65
  $0 evil@example.com
  $0 user@koumbit.org
EOF
}

# this script grew out of this oneliner:
# grep 'from.*info@koumbit.org' /var/log/mail.log | awk '{ print $6 }' | grep -v NOQUEUE | sed -e 's/://' | while read mid; do grep "$mid" /var/log/mail.log; done
if [ $# -lt 1 ]; then
	usage
	exit
fi

pattern="$*"

echo checking for pattern $pattern

# extract the pattern from the logfile
cat <<EOF
zgrep "$pattern" $logfile | sed -n -e "/$mid_pattern/{s/$mid_replace_pattern/\1/
p
}" | uniq | while read mid
EOF
zgrep "$pattern" $logfile | sed -n -e "/$mid_pattern/{s/$mid_replace_pattern/\1/
p
}" | uniq | while read mid
do
    echo
    echo "===================== LOG LINES MATCHING $mid ====================="
    echo
    zgrep $mid $logfile
done