From 79c4ba81fcdaa1c19ef245a657ec2cbf4776c76c Mon Sep 17 00:00:00 2001
From: Brian Read <brianr@koozali.org>
Date: Fri, 13 Jun 2025 09:23:24 +0100
Subject: [PATCH] Add possible script to notify for postfix

---
 postfix_notify.sh | 61 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 postfix_notify.sh

diff --git a/postfix_notify.sh b/postfix_notify.sh
new file mode 100644
index 0000000..5407233
--- /dev/null
+++ b/postfix_notify.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+# postfix-delay-notify.sh
+# Custom delayed mail notifier for Postfix
+
+# Configuration
+DELAY_WARNING_HOURS=4  # Match delay_warning_time in main.cf
+TEMPLATE_FILE="/etc/postfix/delay_template.txt"
+LOCK_FILE="/tmp/postfix-delay-notify.lock"
+LOG_FILE="/var/log/postfix-delay-notify.log"
+
+# Create lock file or exit if already running
+exec 9>"$LOCK_FILE" || exit 1
+flock -n 9 || exit 1
+
+# Function to log messages
+log() {
+    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" >> "$LOG_FILE"
+}
+
+# Check template file exists
+[[ -f "$TEMPLATE_FILE" ]] || {
+    log "Error: Template file $TEMPLATE_FILE not found"
+    exit 1
+}
+
+# Process mail queue
+postqueue -p | awk '
+BEGIN { OFS="|"; FS="[ *]" }
+/^[A-F0-9]{10}\!/ {
+    qid=$1
+    sender=$(NF-1)
+    recipient=$NF
+    time=$3" "$4
+    print qid, sender, recipient, time
+}' | while IFS='|' read -r qid sender recipient queue_time; do
+    
+    # Calculate time in queue (hours)
+    queue_seconds=$(( $(date +%s) - $(date -d "$queue_time" +%s) ))
+    queue_hours=$(( queue_seconds / 3600 ))
+    
+    if [[ $queue_hours -ge $DELAY_WARNING_HOURS ]]; then
+        # Generate notification using template
+        notification=$(sed -e "s/%HOSTNAME%/$(hostname)/g" \
+                          -e "s/%DELAY%/$queue_hours hours/g" \
+                          -e "s/%LIFETIME%/72 hours/g" \
+                          "$TEMPLATE_FILE")
+        
+        # Send notification
+        echo "From: postmaster@$(hostname)
+To: $sender
+Subject: Delivery Delay Notification
+Content-Type: text/plain; charset=utf-8
+
+$notification" | sendmail -t -oi
+        
+        log "Sent delay notification for QID $qid to $sender"
+    fi
+done
+
+# Cleanup
+rm -f "$LOCK_FILE"
\ No newline at end of file