Mailcow: Reforward Messages

#!/bin/bash

# --- CONFIGURATION ---
SOURCE_MAILBOX="mailcow@mydomain.com"
SEARCH_SUBJECT="You Got Tickets"
TARGET_EMAIL="remote@address.com"
LOOKBACK_TIME="12h"  # How far back to search (e.g., 1h, 12h, 1d, 2w)

# --- CONTAINER DETECTION ---
DOVECOT_ID=$(docker ps -qf name=dovecot-mailcow)
POSTFIX_ID=$(docker ps -qf name=postfix-mailcow)

# Check if containers are running
if [ -z "$DOVECOT_ID" ] || [ -z "$POSTFIX_ID" ]; then
    echo "Error: Could not find Mailcow containers. Are you in the mailcow directory?"
    exit 1
fi

# --- EXECUTION ---

echo "Searching for '$SEARCH_SUBJECT' in $SOURCE_MAILBOX within the last $LOOKBACK_TIME..."

# 1. Get the list of GUIDs and UIDs
RESULTS=$(docker exec $DOVECOT_ID doveadm search -u "$SOURCE_MAILBOX" subject "$SEARCH_SUBJECT" since "$LOOKBACK_TIME")

# Count results
COUNT=$(echo "$RESULTS" | grep -c '^' || echo 0)

if [ "$COUNT" -eq 0 ] || [ -z "$RESULTS" ]; then
    echo "No messages found."
    exit 0
fi

echo "Found $COUNT messages. Starting re-forwarding..."

# 2. Loop through the results
echo "$RESULTS" | while read -r guid uid; do
    if [ -z "$uid" ]; then continue; fi 
    
    echo " -> Resending UID: $uid..."
    
    # Fetch content and pipe to Postfix sendmail
    # -f ensures the envelope sender matches your domain to pass SPF
    docker exec $DOVECOT_ID doveadm fetch -u "$SOURCE_MAILBOX" text mailbox-guid "$guid" uid "$uid" | \
    docker exec -i $POSTFIX_ID sendmail -f "$SOURCE_MAILBOX" "$TARGET_EMAIL"
done

echo "Finished. Check the Postfix logs in the Mailcow UI to confirm delivery."