diff --git a/data/Dockerfiles/acme/acme.sh b/data/Dockerfiles/acme/acme.sh
index 271de4fc9..6b7b74300 100755
--- a/data/Dockerfiles/acme/acme.sh
+++ b/data/Dockerfiles/acme/acme.sh
@@ -249,12 +249,33 @@ while true; do
   done <<< "${SQL_DOMAINS}"
 
   if [[ ${ONLY_MAILCOW_HOSTNAME} != "y" ]]; then
+  # Fetch all domains with an active MTA-STS policy once.
+  unset MTA_STS_ACTIVE_DOMAINS
+  declare -A MTA_STS_ACTIVE_DOMAINS
+  if [[ ${AUTODISCOVER_SAN} == "y" ]]; then
+    SQL_MTA_STS_DOMAINS=$(mariadb --skip-ssl --socket=/var/run/mysqld/mysqld.sock -u ${DBUSER} -p${DBPASS} ${DBNAME} -e "SELECT domain FROM mta_sts WHERE active = 1" -Bs)
+    if [[ $? -eq 0 ]]; then
+      while read mta_sts_domain; do
+        if [[ -z "${mta_sts_domain}" ]]; then
+          # ignore empty lines
+          continue
+        fi
+        MTA_STS_ACTIVE_DOMAINS["${mta_sts_domain}"]=1
+      done <<< "${SQL_MTA_STS_DOMAINS}"
+    fi
+  fi
   for SQL_DOMAIN in "${SQL_DOMAIN_ARR[@]}"; do
     unset VALIDATED_CONFIG_DOMAINS_SUBDOMAINS
     declare -a VALIDATED_CONFIG_DOMAINS_SUBDOMAINS
     for SUBDOMAIN in "${ADDITIONAL_WC_ARR[@]}"; do
       FULL_SUBDOMAIN="${SUBDOMAIN}.${SQL_DOMAIN}"
 
+      # Skip mta-sts subdomain unless MTA-STS is enabled (active) for this domain
+      if [[ "${SUBDOMAIN}" == "mta-sts" && -z "${MTA_STS_ACTIVE_DOMAINS[${SQL_DOMAIN}]}" ]]; then
+        log_f "MTA-STS is not enabled for ${SQL_DOMAIN} - skipping mta-sts subdomain certificate"
+        continue
+      fi
+
       # Skip if subdomain matches MAILCOW_HOSTNAME
       if [[ "${FULL_SUBDOMAIN}" == "${MAILCOW_HOSTNAME}" ]]; then
         continue
diff --git a/data/web/lang/lang.de-de.json b/data/web/lang/lang.de-de.json
index c19eb209b..28ad0d72b 100644
--- a/data/web/lang/lang.de-de.json
+++ b/data/web/lang/lang.de-de.json
@@ -728,6 +728,7 @@
         "mta_sts_mx": "MX-Server",
         "mta_sts_mx_info": "Erlaubt das Senden nur an explizit aufgeführte Mailserver-Hostnamen; der sendende MTA überprüft, ob der DNS-MX-Hostname mit der Richtlinienliste übereinstimmt, und erlaubt die Zustellung nur mit einem gültigen TLS-Zertifikat (schützt vor MITM).",
         "mta_sts_mx_notice": "Es können mehrere MX-Server angegeben werden (durch Kommas getrennt).",
+        "mta_sts_active_info": "Wenn nicht angehakt, wird die MTA-STS-Richtlinie nicht veröffentlicht und für die mta-sts-Subdomain kein Zertifikat über ACME angefordert.",
         "multiple_bookings": "Mehrfaches Buchen",
         "nexthop": "Next Hop",
         "none_inherit": "Keine Auswahl / Erben",
diff --git a/data/web/lang/lang.en-gb.json b/data/web/lang/lang.en-gb.json
index 873d7b98d..b8a11e5a5 100644
--- a/data/web/lang/lang.en-gb.json
+++ b/data/web/lang/lang.en-gb.json
@@ -728,6 +728,7 @@
         "mta_sts_mx": "MX server",
         "mta_sts_mx_info": "Allows sending only to explicitly listed mail server hostnames; the sending MTA checks if the DNS MX hostname matches the policy list, and only allows delivery with a valid TLS certificate (guards against MITM).",
         "mta_sts_mx_notice": "Multiple MX servers can be specified (separated by commas).",
+        "mta_sts_active_info": "If unchecked, the MTA-STS policy will not be published and no certificate will be requested for the mta-sts subdomain via ACME.",
         "multiple_bookings": "Multiple bookings",
         "none_inherit": "None / Inherit",
         "nexthop": "Next hop",
diff --git a/data/web/templates/edit/domain.twig b/data/web/templates/edit/domain.twig
index 83353079b..45ec654ce 100644
--- a/data/web/templates/edit/domain.twig
+++ b/data/web/templates/edit/domain.twig
@@ -340,7 +340,7 @@
                   <div class="row mb-4">
                     <div class="offset-sm-2 col-sm-10">
                       <div class="form-check">
-                        <label><input type="checkbox" class="form-check-input" value="1" name="active"{% if mta_sts.active == '1' %} checked{% endif %}> {{ lang.edit.active }}</label>
+                        <label><i style="font-size: 16px; cursor: pointer;" class="bi bi-patch-question-fill m-2 ms-0" data-bs-toggle="tooltip" data-bs-html="true" data-bs-placement="bottom" title="{{ lang.edit.mta_sts_active_info|raw }}"></i><input type="checkbox" class="form-check-input" value="1" name="active"{% if mta_sts.active == '1' %} checked{% endif %}> {{ lang.edit.active }}</label>
                       </div>
                     </div>
                   </div>
diff --git a/docker-compose.yml b/docker-compose.yml
index 76359151b..4742fef17 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -465,7 +465,7 @@ services:
           condition: service_started
         unbound-mailcow:
           condition: service_healthy
-      image: ghcr.io/mailcow/acme:1.97
+      image: ghcr.io/mailcow/acme:1.98
       dns:
         - ${IPV4_NETWORK:-172.22.1}.254
       environment: