Resend Postfix messages stuck in mail queue to another address

reroute-queued-email-messages.sh

#!/bin/bash

# This script allows sending of messages stuck in the Postfix queue to another
# email address.  Useful if the original email address is bad.

if [ $# -ne 2 ]; then
  echo "Usage: reroute-queued-email-messages.sh <oldaddress> <newaddress>"
  exit 1
fi

OLD_ADDRESS="$1"
NEW_ADDRESS="$2"

MAILQ=`which mailq`
POSTCAT=`which postcat`
POSTSUPER=`which postsuper`
SENDMAIL=`which sendmail`
TAIL=`which tail`
GREP=`which grep`
AWK=`which awk`
SED=`which sed`

# Pulls queue IDs for all messages sent to the original address.
function get_ids_by_address {
  $MAILQ | $TAIL -n +2 | $GREP -v '^ *(' | $AWK -v address="$1" 'BEGIN { RS = "" } { if ($8 == address) print $1 }'
}

MESSAGE_IDS=`get_ids_by_address $OLD_ADDRESS`

# Loop through each message ID, output the message, and pipe it through
# sendmail to the new address.
for message_id in $MESSAGE_IDS;
do 
  # Puts the message on hold.
  $POSTSUPER -h $message_id
  # Extract the sender.
  sender=`$POSTCAT -q $message_id | $GREP -m 1 '^From: ' | $SED '/^From: */!d; s///; q'`
  # sed gets rid of the leading queue metadata, grep -v gets rid of the
  # metadata markers.
  $POSTCAT -q $message_id | $SED -n '/MESSAGE CONTENTS/,$p' | $GREP -v "^\*\*\*.*\*\*\*$" | sendmail -f "$sender" $NEW_ADDRESS
  echo "Delivered message ID $message_id to $NEW_ADDRESS"
done

echo -n "Remove old messages from mail queue? [y/N]: "
read delete

if [ "$delete" = "y" ]; then
  for message_id in $MESSAGE_IDS;
  do 
    # Deletes the message from the mail queue by queue ID.
    $POSTSUPER -d $message_id
    echo "Deleted message ID $message_id from queue"
  done
else
  for message_id in $MESSAGE_IDS;
  do
    # Takes the message off hold.
    $POSTSUPER -H $message_id
  done
  echo "The following messages were left in the mail queue:"
  echo "$MESSAGE_IDS"
fi

exit 0

perfekt! you saved my emails and life!