diff --git a/data/Dockerfiles/watchdog/watchdog.sh b/data/Dockerfiles/watchdog/watchdog.sh
index 177a5304..c4b22506 100755
--- a/data/Dockerfiles/watchdog/watchdog.sh
+++ b/data/Dockerfiles/watchdog/watchdog.sh
@@ -109,7 +109,7 @@ function mail_error() {
     SUBJECT="${BODY}"
     BODY="Please see netfilter-mailcow for more details and triggered rules."
   else
-    SUBJECT="Watchdog ALERT: ${1}"
+    SUBJECT="${WATCHDOG_SUBJECT}: ${1}"
   fi
   IFS=',' read -r -a MAIL_RCPTS <<< "${WATCHDOG_NOTIFY_EMAIL}"
   for rcpt in "${MAIL_RCPTS[@]}"; do
diff --git a/docker-compose.yml b/docker-compose.yml
index 0d027d3d..dc69c57c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -437,6 +437,7 @@ services:
         - USE_WATCHDOG=${USE_WATCHDOG:-n}
         - WATCHDOG_NOTIFY_EMAIL=${WATCHDOG_NOTIFY_EMAIL}
         - WATCHDOG_NOTIFY_BAN=${WATCHDOG_NOTIFY_BAN:-y}
+        - WATCHDOG_SUBJECT=${WATCHDOG_SUBJECT:-Watchdog ALERT}
         - WATCHDOG_EXTERNAL_CHECKS=${WATCHDOG_EXTERNAL_CHECKS:-n}
         - WATCHDOG_MYSQL_REPLICATION_CHECKS=${WATCHDOG_MYSQL_REPLICATION_CHECKS:-n}
         - MAILCOW_HOSTNAME=${MAILCOW_HOSTNAME}
diff --git a/generate_config.sh b/generate_config.sh
index 978a32fa..61a90aa0 100755
--- a/generate_config.sh
+++ b/generate_config.sh
@@ -279,6 +279,9 @@ USE_WATCHDOG=y
 # Notify about banned IP (includes whois lookup)
 WATCHDOG_NOTIFY_BAN=n
 
+# Subject for watchdog mails. Defaults to "Watchdog ALERT" followed by the error message.
+#WATCHDOG_SUBJECT=
+
 # Checks if mailcow is an open relay. Requires a SAL. More checks will follow.
 # https://www.servercow.de/mailcow?lang=en
 # https://www.servercow.de/mailcow?lang=de
diff --git a/update.sh b/update.sh
index 138e01f3..d5114c9f 100755
--- a/update.sh
+++ b/update.sh
@@ -191,6 +191,7 @@ CONFIG_ARRAY=(
   "WATCHDOG_NOTIFY_EMAIL"
   "WATCHDOG_NOTIFY_BAN"
   "WATCHDOG_EXTERNAL_CHECKS"
+  "WATCHDOG_SUBJECT"
   "SKIP_CLAMD"
   "SKIP_IP_CHECK"
   "ADDITIONAL_SAN"
@@ -361,6 +362,12 @@ for option in ${CONFIG_ARRAY[@]}; do
       echo '# Notify about banned IP. Includes whois lookup.' >> mailcow.conf
       echo "WATCHDOG_NOTIFY_BAN=y" >> mailcow.conf
     fi
+  elif [[ ${option} == "WATCHDOG_SUBJECT" ]]; then
+    if ! grep -q ${option} mailcow.conf; then
+      echo "Adding new option \"${option}\" to mailcow.conf"
+      echo '# Subject for watchdog mails. Defaults to "Watchdog ALERT" followed by the error message.' >> mailcow.conf
+      echo "#WATCHDOG_SUBJECT=" >> mailcow.conf
+    fi
   elif [[ ${option} == "WATCHDOG_EXTERNAL_CHECKS" ]]; then
     if ! grep -q ${option} mailcow.conf; then
       echo "Adding new option \"${option}\" to mailcow.conf"