diff --git a/.github/workflows/close_old_issues_and_prs.yml b/.github/workflows/close_old_issues_and_prs.yml
index bba04b0d1..13dbac279 100644
--- a/.github/workflows/close_old_issues_and_prs.yml
+++ b/.github/workflows/close_old_issues_and_prs.yml
@@ -14,7 +14,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Mark/Close Stale Issues and Pull Requests 🗑️
-        uses: actions/stale@v10.4.0
+        uses: actions/stale@v11.0.0
         with:
           repo-token: ${{ secrets.STALE_ACTION_PAT }}
           days-before-stale: 60
diff --git a/data/Dockerfiles/acme/acme.sh b/data/Dockerfiles/acme/acme.sh
index 271de4fc9..6b7b74300 100755
--- a/data/Dockerfiles/acme/acme.sh
+++ b/data/Dockerfiles/acme/acme.sh
@@ -249,12 +249,33 @@ while true; do
   done <<< "${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/Dockerfiles/nginx/Dockerfile b/data/Dockerfiles/nginx/Dockerfile
index 65b34838e..d3280a33d 100644
--- a/data/Dockerfiles/nginx/Dockerfile
+++ b/data/Dockerfiles/nginx/Dockerfile
@@ -1,4 +1,4 @@
-FROM nginx:1.30.3-alpine
+FROM nginx:1.30.4-alpine
 LABEL maintainer "The Infrastructure Company GmbH <info@servercow.de>"
 
 ENV PIP_BREAK_SYSTEM_PACKAGES=1
diff --git a/data/Dockerfiles/rspamd/Dockerfile b/data/Dockerfiles/rspamd/Dockerfile
index d37d1226a..13e56357b 100644
--- a/data/Dockerfiles/rspamd/Dockerfile
+++ b/data/Dockerfiles/rspamd/Dockerfile
@@ -2,7 +2,7 @@ FROM debian:trixie-slim
 LABEL maintainer="The Infrastructure Company GmbH <info@servercow.de>"
 
 ARG DEBIAN_FRONTEND=noninteractive
-ARG RSPAMD_VER=rspamd_4.1.0-1~e2b0b18
+ARG RSPAMD_VER=rspamd_4.1.4-1~beb659b
 ARG CODENAME=trixie
 ENV LC_ALL=C
 
diff --git a/data/conf/nginx/templates/nginx.conf.j2 b/data/conf/nginx/templates/nginx.conf.j2
index 08a85a144..861c7e560 100644
--- a/data/conf/nginx/templates/nginx.conf.j2
+++ b/data/conf/nginx/templates/nginx.conf.j2
@@ -42,12 +42,19 @@ http {
         https https;
     }
 
+    map $server_port $sogo_auth_internal {
+        65510   "1";
+        default "";
+    }
+
     {% if HTTP_REDIRECT %}
     # HTTP to HTTPS redirect
     server {
         root /web;
         listen {{ HTTP_PORT }} default_server;
+        {% if ENABLE_IPV6 %}
         listen [::]:{{ HTTP_PORT }} default_server;
+        {%endif%}
 
         server_name {{ MAILCOW_HOSTNAME }} autodiscover.* autoconfig.* mta-sts.* {{ ADDITIONAL_SERVER_NAMES | join(' ') }};
 
diff --git a/data/conf/nginx/templates/sites-default.conf.j2 b/data/conf/nginx/templates/sites-default.conf.j2
index 84bd8eae4..688f2baa6 100644
--- a/data/conf/nginx/templates/sites-default.conf.j2
+++ b/data/conf/nginx/templates/sites-default.conf.j2
@@ -116,6 +116,8 @@ location ~ \.php$ {
     include /etc/nginx/fastcgi_params;
     fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
     fastcgi_param PATH_INFO $fastcgi_path_info;
+    # trusted internal-auth marker; empty for external clients (see nginx.conf map)
+    fastcgi_param SOGO_AUTH_INTERNAL $sogo_auth_internal;
     fastcgi_read_timeout 3600;
     fastcgi_send_timeout 3600;
 }
diff --git a/data/conf/rspamd/meta_exporter/pipe.php b/data/conf/rspamd/meta_exporter/pipe.php
index 0a9ed59e2..28b06d3d6 100644
--- a/data/conf/rspamd/meta_exporter/pipe.php
+++ b/data/conf/rspamd/meta_exporter/pipe.php
@@ -53,7 +53,7 @@ $raw_data = mb_convert_encoding($raw_data_content, 'HTML-ENTITIES', "UTF-8");
 $raw_size = (int)$_FILES['message']['size'];
 
 $qid      = $meta['qid']     ?? 'unknown';
-$subject  = iconv_mime_decode($meta['subject'] ?? '');
+$subject  = $meta['subject'] ?? '';
 $score    = $meta['score']   ?? 0;
 $rcpts    = $meta['rcpt']    ?? array();
 $user     = $meta['user']    ?? 'unknown';
diff --git a/data/conf/rspamd/meta_exporter/pushover.php b/data/conf/rspamd/meta_exporter/pushover.php
index a2cd0995b..188d0a57b 100644
--- a/data/conf/rspamd/meta_exporter/pushover.php
+++ b/data/conf/rspamd/meta_exporter/pushover.php
@@ -50,7 +50,7 @@ $qid      = $meta['qid']    ?? 'unknown';
 $rcpts    = $meta['rcpt']   ?? array();
 $sender   = $meta['from']   ?? '';
 $ip       = $meta['ip']     ?? 'unknown';
-$subject  = iconv_mime_decode($meta['subject'] ?? '');
+$subject  = $meta['subject'] ?? '';
 $messageid= $meta['message_id'] ?? '';
 $priority = 0;
 
diff --git a/data/web/api/openapi.yaml b/data/web/api/openapi.yaml
index 77c58b609..c86561903 100644
--- a/data/web/api/openapi.yaml
+++ b/data/web/api/openapi.yaml
@@ -185,6 +185,9 @@ paths:
               example:
                 username: info@domain.tld
                 domain: domain.tld
+                description: my time limited alias
+                validity: 8760
+                permanent: false
               properties:
                 username:
                   description: 'the mailbox an alias should be created for'
@@ -192,6 +195,15 @@ paths:
                 domain:
                   description: "the domain"
                   type: string
+                description:
+                  description: "a description for the alias, defaults to an empty string"
+                  type: string
+                validity:
+                  description: "how many hours the alias stays valid, 1 to 87600, defaults to 8760 (one year)"
+                  type: integer
+                permanent:
+                  description: "keep the alias after it expired, defaults to false"
+                  type: boolean
               type: object
       summary: Create time limited alias
   /api/v1/add/app-passwd:
@@ -4908,6 +4920,7 @@ paths:
                       quota: 3221225472
                       quota_used: 0
                       rl: false
+                      sender_acl: ["otherbox@doman3.tld", "@aliasdomain.tld"]
                       spam_aliases: 0
                       username: info@doman3.tld
                       tags: ["tag1", "tag2"]
@@ -5834,6 +5847,7 @@ paths:
                       quota: 3221225472
                       quota_used: 0
                       rl: false
+                      sender_acl: ["otherbox@domain3.tld", "@aliasdomain.tld"]
                       spam_aliases: 0
                       username: info@domain3.tld
                       tags: ["tag1", "tag2"]
@@ -5856,7 +5870,7 @@ paths:
                 response:
                   value:
                     - type: "success"
-                      log: ["cors", "edit", {"allowed_origins": ["*", "mail.mailcow.tld"], "allowed_methods": ["POST", "GET", "DELETE", "PUT"]}]
+                      log: ["cors", "edit", {"allowed_origins": ["*", "https://mail.mailcow.tld"], "allowed_methods": ["POST", "GET", "DELETE", "PUT"]}]
                       msg: "cors_headers_edited"
           description: OK
           headers: { }
@@ -5873,7 +5887,7 @@ paths:
             schema:
               example:
                 attr:
-                  allowed_origins: ["*", "mail.mailcow.tld"]
+                  allowed_origins: ["*", "https://mail.mailcow.tld"]
                   allowed_methods: ["POST", "GET", "DELETE", "PUT"]
               properties:
                 attr:
diff --git a/data/web/inc/ajax/update_check.php b/data/web/inc/ajax/update_check.php
new file mode 100644
index 000000000..6bf016001
--- /dev/null
+++ b/data/web/inc/ajax/update_check.php
@@ -0,0 +1,67 @@
+<?php
+require_once $_SERVER['DOCUMENT_ROOT'] . '/inc/prerequisites.inc.php';
+
+header('Content-Type: application/json');
+
+// Admins only
+if (!isset($_SESSION['mailcow_cc_role']) || $_SESSION['mailcow_cc_role'] !== 'admin') {
+  http_response_code(403);
+  echo json_encode(array('status' => 'error', 'message' => 'access denied'));
+  exit;
+}
+
+$owner   = $GLOBALS['MAILCOW_GIT_OWNER'];
+$repo    = $GLOBALS['MAILCOW_GIT_REPO'];
+$current = $GLOBALS['MAILCOW_GIT_VERSION'];
+
+// Cache key is bound to the running version, so an update invalidates it naturally
+$cache_key = 'MAILCOW_UPDATE_CHECK/' . $current;
+
+// Serve cached result if present (one GitHub call per TTL, not one per page load)
+$cached = $redis->get($cache_key);
+if ($cached !== false) {
+  echo $cached;
+  exit;
+}
+
+// GitHub requires a User-Agent and rate-limits unauthenticated requests to 60/h per IP
+function github_get($url) {
+  $ch = curl_init($url);
+  curl_setopt_array($ch, array(
+    CURLOPT_RETURNTRANSFER => true,
+    CURLOPT_USERAGENT      => 'mailcow-update-check',
+    CURLOPT_TIMEOUT        => 10,
+    CURLOPT_HTTPHEADER     => array('Accept: application/vnd.github+json'),
+  ));
+  $body = curl_exec($ch);
+  $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+  curl_close($ch);
+  if ($body === false || $code !== 200) return false;
+  $json = json_decode($body, true);
+  return is_array($json) ? $json : false;
+}
+
+$latest  = github_get("https://api.github.com/repos/{$owner}/{$repo}/releases/latest");
+$release = github_get("https://api.github.com/repos/{$owner}/{$repo}/releases/tags/{$current}");
+
+// Any failure (rate limit, offline, unexpected payload) -> honest error, cached briefly
+if ($latest === false || $release === false ||
+    empty($latest['tag_name']) || empty($latest['created_at']) || empty($release['created_at'])) {
+  $result = json_encode(array('status' => 'error', 'message' => 'could not reach GitHub API'));
+  $redis->setex($cache_key, 300, $result);
+  echo $result;
+  exit;
+}
+
+$date_latest  = strtotime($latest['created_at']);
+$date_current = strtotime($release['created_at']);
+
+if ($date_latest <= $date_current) {
+  $result = json_encode(array('status' => 'no_update'));
+} else {
+  $result = json_encode(array('status' => 'update_available', 'latest_tag' => $latest['tag_name']));
+}
+
+// Cache the positive result for an hour
+$redis->setex($cache_key, 3600, $result);
+echo $result;
diff --git a/data/web/inc/functions.domain_admin.inc.php b/data/web/inc/functions.domain_admin.inc.php
index 46b651b85..17aa4ad6a 100644
--- a/data/web/inc/functions.domain_admin.inc.php
+++ b/data/web/inc/functions.domain_admin.inc.php
@@ -429,14 +429,25 @@ function domain_admin_sso($_action, $_data) {
 
   switch ($_action) {
     case 'check':
-      $token = $_data;
+      $token = preg_replace('/[^a-zA-Z0-9-]/', '', $_data);
 
       $stmt = $pdo->prepare("SELECT `t1`.`username` FROM `da_sso` AS `t1` JOIN `admin` AS `t2` ON `t1`.`username` = `t2`.`username` WHERE `t1`.`token` = :token AND `t1`.`created` > DATE_SUB(NOW(), INTERVAL '30' SECOND) AND `t2`.`active` = 1 AND `t2`.`superadmin` = 0;");
       $stmt->execute(array(
-        ':token' => preg_replace('/[^a-zA-Z0-9-]/', '', $token)
+        ':token' => $token
       ));
       $return = $stmt->fetch(PDO::FETCH_ASSOC);
-      return empty($return['username']) ? false : $return['username'];
+      if (empty($return['username'])) {
+        return false;
+      }
+      // single-use: consume the token; if a concurrent request already used it, deny
+      $del = $pdo->prepare("DELETE FROM `da_sso` WHERE `token` = :token");
+      $del->execute(array(
+        ':token' => $token
+      ));
+      if ($del->rowCount() < 1) {
+        return false;
+      }
+      return $return['username'];
     case 'issue':
       if ($_SESSION['mailcow_cc_role'] != "admin") {
         $_SESSION['return'][] = array(
diff --git a/data/web/inc/functions.inc.php b/data/web/inc/functions.inc.php
index 89f14b574..dfd860a9b 100644
--- a/data/web/inc/functions.inc.php
+++ b/data/web/inc/functions.inc.php
@@ -53,6 +53,39 @@ function valid_network($network) {
 function valid_hostname($hostname) {
   return filter_var($hostname, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME);
 }
+// Validates a browser-style Origin: scheme://host[:port], no path/query/fragment/credentials
+function valid_origin($origin) {
+  $parts = parse_url($origin);
+  if ($parts === false || !isset($parts['scheme']) || !isset($parts['host'])) {
+    return false;
+  }
+  if (!in_array(strtolower($parts['scheme']), array('http', 'https'), true)) {
+    return false;
+  }
+  if (isset($parts['user']) || isset($parts['pass']) || isset($parts['path']) || isset($parts['query']) || isset($parts['fragment'])) {
+    return false;
+  }
+  $host = $parts['host'];
+  $host_without_brackets = trim($host, '[]');
+  if (!valid_hostname($host_without_brackets) && !filter_var($host_without_brackets, FILTER_VALIDATE_IP)) {
+    return false;
+  }
+  // Reject anything that doesn't round-trip to the exact same origin (e.g. stray trailing slash)
+  $port = isset($parts['port']) ? ':' . $parts['port'] : '';
+  $rebuilt = strtolower($parts['scheme']) . '://' . strtolower($host) . $port;
+  return strtolower($origin) === $rebuilt;
+}
+// Bring an origin into the exact form a browser sends it (scheme://host[:port], lowercase).
+function normalize_cors_origin($origin) {
+  $origin = trim($origin);
+  if ($origin === '*') {
+    return '*';
+  }
+  if ($origin !== '' && !preg_match('~^[a-z][a-z0-9+.-]*://~i', $origin)) {
+    $origin = 'https://' . $origin;
+  }
+  return valid_origin($origin) ? strtolower($origin) : false;
+}
 // Thanks to https://stackoverflow.com/a/49373789
 // Validates exact ip matches and ip-in-cidr, ipv4 and ipv6
 function ip_acl($ip, $networks) {
@@ -2283,10 +2316,13 @@ function cors($action, $data = null) {
         return false;
       }
 
-      $allowed_origins = isset($data['allowed_origins']) ? $data['allowed_origins'] : array($_SERVER['SERVER_NAME']);
+      $allowed_origins = isset($data['allowed_origins']) ? $data['allowed_origins'] : array(getBaseURL());
       $allowed_origins = !is_array($allowed_origins) ? array_filter(array_map('trim', explode("\n", $allowed_origins))) : $allowed_origins;
-      foreach ($allowed_origins as $origin) {
-        if (!filter_var($origin, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME) && $origin != '*') {
+      foreach ($allowed_origins as &$origin) {
+        if ($origin === '*') {
+          continue;
+        }
+        if (!valid_origin($origin)) {
           $_SESSION['return'][] = array(
             'type' => 'danger',
             'log' => array(__FUNCTION__, $action, $data),
@@ -2294,7 +2330,10 @@ function cors($action, $data = null) {
           );
           return false;
         }
+        // browsers always send a lowercase scheme/host in the Origin header, so normalize to match
+        $origin = strtolower($origin);
       }
+      unset($origin);
 
       $allowed_methods = isset($data['allowed_methods']) ? $data['allowed_methods'] : array('GET', 'POST', 'PUT', 'DELETE');
       $allowed_methods  = !is_array($allowed_methods) ? array_map('trim', preg_split( "/( |,|;|\n)/", $allowed_methods)) : $allowed_methods;
@@ -2342,26 +2381,35 @@ function cors($action, $data = null) {
         );
       }
 
-      $cors_settings                    = !$cors_settings ? array('allowed_origins' => $_SERVER['SERVER_NAME'], 'allowed_methods' => 'GET, POST, PUT, DELETE') : $cors_settings;
-      $cors_settings['allowed_origins'] = empty($cors_settings['allowed_origins']) ? $_SERVER['SERVER_NAME'] : $cors_settings['allowed_origins'];
+      $cors_settings                    = !$cors_settings ? array('allowed_origins' => getBaseURL(), 'allowed_methods' => 'GET, POST, PUT, DELETE') : $cors_settings;
+      $cors_settings['allowed_origins'] = empty($cors_settings['allowed_origins']) ? getBaseURL() : $cors_settings['allowed_origins'];
       $cors_settings['allowed_methods'] = empty($cors_settings['allowed_methods']) ? 'GET, POST, PUT, DELETE, OPTION' : $cors_settings['allowed_methods'];
 
       return $cors_settings;
     break;
     case "set_headers":
       $cors_settings = cors('get');
+      // normalize the stored list; it may still hold bare hostnames written before origins were validated as origins
+      $allowed_origins = array_filter(array_map('normalize_cors_origin', explode(',', $cors_settings['allowed_origins'])));
+      $origin = isset($_SERVER['HTTP_ORIGIN']) ? normalize_cors_origin($_SERVER['HTTP_ORIGIN']) : false;
       // check if requested origin is in allowed origins
-      $allowed_origins = explode(', ', $cors_settings['allowed_origins']);
-      $cors_settings['allowed_origins'] = $allowed_origins[0];
-      if (in_array('*', $allowed_origins)){
-        $cors_settings['allowed_origins'] = '*';
-      } else if (array_key_exists('HTTP_ORIGIN', $_SERVER) && in_array($_SERVER['HTTP_ORIGIN'], $allowed_origins)) {
-        $cors_settings['allowed_origins'] = $_SERVER['HTTP_ORIGIN'];
+      $allow_origin = null;
+      if (in_array('*', $allowed_origins, true)) {
+        $allow_origin = '*';
+      } else if ($origin !== false && in_array($origin, $allowed_origins, true)) {
+        $allow_origin = $origin;
       }
       // always allow OPTIONS for preflight request
       $cors_settings["allowed_methods"] = empty($cors_settings["allowed_methods"]) ? 'OPTIONS' : $cors_settings["allowed_methods"] . ', ' . 'OPTIONS';
 
-      header('Access-Control-Allow-Origin: ' . $cors_settings['allowed_origins']);
+      // a disallowed origin gets no Access-Control-Allow-Origin at all; echoing a different origin than the requesting one tells a browser nothing
+      if ($allow_origin !== null) {
+        header('Access-Control-Allow-Origin: ' . $allow_origin);
+      }
+      if ($allow_origin !== '*') {
+        // the response depends on the request origin, keep caches from mixing them up
+        header('Vary: Origin', false);
+      }
       header('Access-Control-Allow-Methods: '. $cors_settings['allowed_methods']);
       header('Access-Control-Allow-Headers: Accept, Content-Type, X-Api-Key, Origin');
 
diff --git a/data/web/inc/functions.mailbox.inc.php b/data/web/inc/functions.mailbox.inc.php
index a9f17705d..acbbb94d4 100644
--- a/data/web/inc/functions.mailbox.inc.php
+++ b/data/web/inc/functions.mailbox.inc.php
@@ -41,13 +41,15 @@ function mailbox($_action, $_type, $_data = null, $_extra = null) {
           else {
             $username = $_SESSION['mailcow_cc_username'];
           }
-          if (isset($_data["validity"]) && !filter_var($_data["validity"], FILTER_VALIDATE_INT, array('options' => array('min_range' => 1, 'max_range' => 87600)))) {
-            $_SESSION['return'][] = array(
-              'type' => 'danger',
-              'log' => array(__FUNCTION__, $_action, $_type, $_data_log, $_attr),
-              'msg' => 'validity_missing'
-            );
-            return false;
+          if (isset($_data["validity"])) {
+            if (!filter_var($_data["validity"], FILTER_VALIDATE_INT, array('options' => array('min_range' => 1, 'max_range' => 87600)))) {
+              $_SESSION['return'][] = array(
+                'type' => 'danger',
+                'log' => array(__FUNCTION__, $_action, $_type, $_data_log, $_attr),
+                'msg' => 'validity_missing'
+              );
+              return false;
+            }
           }
           else {
             // Default to 1 yr
@@ -60,7 +62,8 @@ function mailbox($_action, $_type, $_data = null, $_extra = null) {
             $permanent = 0;
           }
           $domain = $_data['domain'];
-          $description = $_data['description'];
+          // spamalias.description is NOT NULL, an absent description must not become a null insert
+          $description = $_data['description'] ?? '';
           $valid_domains[] = mailbox('get', 'mailbox_details', $username)['domain'];
           $valid_alias_domains = user_get_alias_details($username)['alias_domains'];
           if (!empty($valid_alias_domains)) {
@@ -5320,6 +5323,14 @@ function mailbox($_action, $_type, $_data = null, $_extra = null) {
               $mailboxdata['rl_scope'] = 'domain';
             }
             $mailboxdata['is_relayed'] = $row['backupmx'];
+            // Internal send-as ACL for this mailbox, mirrors the sender_acl field accepted by edit/mailbox
+            $mailboxdata['sender_acl'] = array();
+            $stmt = $pdo->prepare("SELECT `send_as` FROM `sender_acl` WHERE `logged_in_as` = :username AND `external` = '0'");
+            $stmt->execute(array(':username' => $_data));
+            $sender_acl_rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
+            foreach ($sender_acl_rows as $sender_acl_row) {
+              $mailboxdata['sender_acl'][] = $sender_acl_row['send_as'];
+            }
           }
           $stmt = $pdo->prepare("SELECT `tag_name`
             FROM `tags_mailbox` WHERE `username`= :username");
@@ -5647,8 +5658,11 @@ function mailbox($_action, $_type, $_data = null, $_extra = null) {
             $stmt->execute(array(
               ':username' => $username
             ));
-            $stmt = $pdo->prepare("DELETE FROM `sogo_acl` WHERE `c_object` LIKE '%/" . $username . "/%' OR `c_uid` = :username");
+            // bind LIKE pattern + escape LIKE wildcards so the value matches literally (no SQLi, no over-match)
+            $c_object_like = '%/' . addcslashes($username, '\\%_') . '/%';
+            $stmt = $pdo->prepare("DELETE FROM `sogo_acl` WHERE `c_object` LIKE :c_object_like OR `c_uid` = :username");
             $stmt->execute(array(
+              ':c_object_like' => $c_object_like,
               ':username' => $username
             ));
             $stmt = $pdo->prepare("DELETE FROM `sogo_store` WHERE `c_folder_id` IN (SELECT `c_folder_id` FROM `sogo_folder_info` WHERE `c_path2` = :username)");
@@ -6044,8 +6058,11 @@ function mailbox($_action, $_type, $_data = null, $_extra = null) {
             $stmt->execute(array(
               ':username' => $username
             ));
-            $stmt = $pdo->prepare("DELETE FROM `sogo_acl` WHERE `c_object` LIKE '%/" . str_replace('%', '\%', $username) . "/%' OR `c_uid` = :username");
+            // bind LIKE pattern + escape LIKE wildcards so the value matches literally (no SQLi, no over-match)
+            $c_object_like = '%/' . addcslashes($username, '\\%_') . '/%';
+            $stmt = $pdo->prepare("DELETE FROM `sogo_acl` WHERE `c_object` LIKE :c_object_like OR `c_uid` = :username");
             $stmt->execute(array(
+              ':c_object_like' => $c_object_like,
               ':username' => $username
             ));
             $stmt = $pdo->prepare("DELETE FROM `sogo_store` WHERE `c_folder_id` IN (SELECT `c_folder_id` FROM `sogo_folder_info` WHERE `c_path2` = :username)");
@@ -6201,8 +6218,11 @@ function mailbox($_action, $_type, $_data = null, $_extra = null) {
             $stmt->execute(array(
               ':username' => $name
             ));
-            $stmt = $pdo->prepare("DELETE FROM `sogo_acl` WHERE `c_object` LIKE '%/" . $name . "/%' OR `c_uid` = :username");
+            // bind LIKE pattern + escape LIKE wildcards so the value matches literally (no SQLi, no over-match)
+            $c_object_like = '%/' . addcslashes($name, '\\%_') . '/%';
+            $stmt = $pdo->prepare("DELETE FROM `sogo_acl` WHERE `c_object` LIKE :c_object_like OR `c_uid` = :username");
             $stmt->execute(array(
+              ':c_object_like' => $c_object_like,
               ':username' => $name
             ));
             $stmt = $pdo->prepare("DELETE FROM `sogo_store` WHERE `c_folder_id` IN (SELECT `c_folder_id` FROM `sogo_folder_info` WHERE `c_path2` = :username)");
diff --git a/data/web/inc/functions.quarantine.inc.php b/data/web/inc/functions.quarantine.inc.php
index 5df86ef33..c89b3e408 100644
--- a/data/web/inc/functions.quarantine.inc.php
+++ b/data/web/inc/functions.quarantine.inc.php
@@ -22,7 +22,7 @@ function quarantine($_action, $_data = null) {
         return false;
       }
       $stmt = $pdo->prepare('SELECT `id` FROM `quarantine` LEFT OUTER JOIN `user_acl` ON `user_acl`.`username` = `rcpt`
-        WHERE `qhash` = :hash
+        WHERE `qhash` = :hash
           AND user_acl.quarantine = 1
           AND rcpt IN (SELECT username FROM mailbox)');
       $stmt->execute(array(':hash' => $hash));
@@ -65,7 +65,7 @@ function quarantine($_action, $_data = null) {
         return false;
       }
       $stmt = $pdo->prepare('SELECT `id` FROM `quarantine` LEFT OUTER JOIN `user_acl` ON `user_acl`.`username` = `rcpt`
-        WHERE `qhash` = :hash
+        WHERE `qhash` = :hash
           AND `user_acl`.`quarantine` = 1
           AND `username` IN (SELECT `username` FROM `mailbox`)');
       $stmt->execute(array(':hash' => $hash));
@@ -170,6 +170,8 @@ function quarantine($_action, $_data = null) {
         }
         elseif ($release_format == 'raw') {
           $detail_row['msg'] = preg_replace('/^X-Spam-Flag: (.*)/m', 'X-Pre-Release-Spam-Flag: $1', $detail_row['msg']);
+          // dot-stuffing per RFC5321 4.5.2: escape leading dots
+          $detail_row['msg'] = preg_replace('~^\.~m', '..', $detail_row['msg']);
           $postfix_talk = array(
             array('220', 'HELO quarantine' . chr(10)),
             array('250', 'MAIL FROM: ' . $sender . chr(10)),
@@ -180,7 +182,7 @@ function quarantine($_action, $_data = null) {
             array('221', '')
           );
           // Thanks to https://stackoverflow.com/questions/6632399/given-an-email-as-raw-text-how-can-i-send-it-using-php
-          $smtp_connection = fsockopen($postfix, 590, $errno, $errstr, 1); 
+          $smtp_connection = fsockopen($postfix, 590, $errno, $errstr, 1);
           if (!$smtp_connection) {
             logger(array('return' => array(
               array(
@@ -192,7 +194,7 @@ function quarantine($_action, $_data = null) {
             return false;
           }
           for ($i=0; $i < count($postfix_talk); $i++) {
-            $smtp_resource = fgets($smtp_connection, 256); 
+            $smtp_resource = fgets($smtp_connection, 256);
             if (substr($smtp_resource, 0, 3) !== $postfix_talk[$i][0]) {
               $ret = substr($smtp_resource, 0, 3);
               $ret = (empty($ret)) ? '-' : $ret;
@@ -465,17 +467,19 @@ function quarantine($_action, $_data = null) {
           }
           elseif ($release_format == 'raw') {
             $row['msg'] = preg_replace('/^X-Spam-Flag: (.*)/m', 'X-Pre-Release-Spam-Flag: $1', $row['msg']);
+            // dot-stuffing per RFC5321 4.5.2: escape leading dots
+            $row['msg'] = preg_replace('~^\.~m', '..', $row['msg']);
             $postfix_talk = array(
               array('220', 'HELO quarantine' . chr(10)),
               array('250', 'MAIL FROM: ' . $sender . chr(10)),
               array('250', 'RCPT TO: ' . $row['rcpt'] . chr(10)),
               array('250', 'DATA' . chr(10)),
-              array('354', str_replace("\n.", '', $row['msg']) . chr(10) . '.' . chr(10)),
+              array('354', $row['msg'] . chr(10) . '.' . chr(10)),
               array('250', 'QUIT' . chr(10)),
               array('221', '')
             );
             // Thanks to https://stackoverflow.com/questions/6632399/given-an-email-as-raw-text-how-can-i-send-it-using-php
-            $smtp_connection = fsockopen($postfix, 590, $errno, $errstr, 1); 
+            $smtp_connection = fsockopen($postfix, 590, $errno, $errstr, 1);
             if (!$smtp_connection) {
               $_SESSION['return'][] = array(
                 'type' => 'warning',
@@ -485,7 +489,7 @@ function quarantine($_action, $_data = null) {
               return false;
             }
             for ($i=0; $i < count($postfix_talk); $i++) {
-              $smtp_resource = fgets($smtp_connection, 256); 
+              $smtp_resource = fgets($smtp_connection, 256);
               if (substr($smtp_resource, 0, 3) !== $postfix_talk[$i][0]) {
                 $ret = substr($smtp_resource, 0, 3);
                 $ret = (empty($ret)) ? '-' : $ret;
@@ -833,7 +837,7 @@ function quarantine($_action, $_data = null) {
         )));
         return false;
       }
-      $stmt = $pdo->prepare('SELECT * FROM `quarantine` WHERE `qhash` = :hash');
+      $stmt = $pdo->prepare('SELECT * FROM `quarantine` WHERE `qhash` = :hash');
       $stmt->execute(array(':hash' => $hash));
       return $stmt->fetch(PDO::FETCH_ASSOC);
     break;
diff --git a/data/web/inc/init_db.inc.php b/data/web/inc/init_db.inc.php
index 72018a6bc..23aa5e77f 100644
--- a/data/web/inc/init_db.inc.php
+++ b/data/web/inc/init_db.inc.php
@@ -1464,6 +1464,8 @@ function init_db_schema()
         "pop3_access" => intval($GLOBALS['MAILBOX_DEFAULT_ATTRIBUTES']['pop3_access']),
         "smtp_access" => intval($GLOBALS['MAILBOX_DEFAULT_ATTRIBUTES']['smtp_access']),
         "sieve_access" => intval($GLOBALS['MAILBOX_DEFAULT_ATTRIBUTES']['sieve_access']),
+        "eas_access" => intval($GLOBALS['MAILBOX_DEFAULT_ATTRIBUTES']['eas_access']),
+        "dav_access" => intval($GLOBALS['MAILBOX_DEFAULT_ATTRIBUTES']['dav_access']),
         "acl_spam_alias" => 1,
         "acl_tls_policy" => 1,
         "acl_spam_score" => 1,
diff --git a/data/web/js/site/dashboard.js b/data/web/js/site/dashboard.js
index aee361710..d591f8ac0 100644
--- a/data/web/js/site/dashboard.js
+++ b/data/web/js/site/dashboard.js
@@ -30,7 +30,7 @@ $(document).ready(function() {
   // create host cpu and mem charts
   createHostCpuAndMemChart();
   // check for new version
-  if (mailcow_info.branch === "master"){
+  if (mailcow_info.branch === "master" && mailcow_cc_role === "admin"){
     check_update(mailcow_info.version_tag, mailcow_info.project_url);
   }
   $("#mailcow_version").click(function(){
@@ -1089,6 +1089,8 @@ jQuery(function($){
         return str;
       }).join('<br>\n');
       item.subject = escapeHtml(item.subject);
+      if (item.sender_mime != null) item.sender_mime = escapeHtml(item.sender_mime);
+      if (item['message-id'] != null) item['message-id'] = escapeHtml(item['message-id']);
       var scan_time = item.time_real.toFixed(3);
       if (item.time_virtual) {
         scan_time += ' / ' + item.time_virtual.toFixed(3);
@@ -1212,6 +1214,11 @@ jQuery(function($){
       });
     } else if (table == 'rllog') {
       $.each(data, function (i, item) {
+        if (item.header_from != null) item.header_from = escapeHtml(item.header_from);
+        if (item.header_subject != null) item.header_subject = escapeHtml(item.header_subject);
+        if (item.from != null) item.from = escapeHtml(item.from);
+        if (item.rcpt != null) item.rcpt = escapeHtml(item.rcpt);
+        if (item.message_id != null) item.message_id = escapeHtml(item.message_id);
         if (item.user == null) {
           item.user = "none";
         }
@@ -1669,41 +1676,26 @@ function createHostCpuAndMemChart(){
 function check_update(current_version, github_repo_url){
   if (!current_version || !github_repo_url) return false;
 
-  var github_account = github_repo_url.split("/")[3];
-  var github_repo_name = github_repo_url.split("/")[4];
 
-  // get details about latest release
-  window.fetch("https://api.github.com/repos/"+github_account+"/"+github_repo_name+"/releases/latest", {method:'GET',cache:'no-cache'}).then(function(response) {
+  window.fetch("/inc/ajax/update_check.php", {method:'GET',cache:'no-cache'}).then(function(response) {
+    if (!response.ok) throw new Error("update check returned " + response.status);
     return response.json();
-  }).then(function(latest_data) {
-    // get details about current release
-    window.fetch("https://api.github.com/repos/"+github_account+"/"+github_repo_name+"/releases/tags/"+current_version, {method:'GET',cache:'no-cache'}).then(function(response) {
-      return response.json();
-    }).then(function(current_data) {
-      // compare releases
-      var date_current = new Date(current_data.created_at);
-      var date_latest = new Date(latest_data.created_at);
-      if (date_latest.getTime() <= date_current.getTime()){
-        // no update available
-        $("#mailcow_update").removeClass("text-warning text-danger").addClass("text-success");
-        $("#mailcow_update").html("<b>" + lang_debug.no_update_available + "</b>");
-      } else {
-        // update available
-        $("#mailcow_update").removeClass("text-danger text-success").addClass("text-warning");
-        $("#mailcow_update").html(lang_debug.update_available + ` <a href="#" id="mailcow_update_changelog">`+latest_data.tag_name+`</a>`);
-        $("#mailcow_update_changelog").click(function(){
-          if (mailcow_cc_role !== "admin" && mailcow_cc_role !== "domainadmin")
-            return;
+  }).then(function(data) {
+    if (data.status === "no_update") {
+      $("#mailcow_update").removeClass("text-warning text-danger").addClass("text-success");
+      $("#mailcow_update").html("<b>" + lang_debug.no_update_available + "</b>");
+    } else if (data.status === "update_available") {
+      $("#mailcow_update").removeClass("text-danger text-success").addClass("text-warning");
+      $("#mailcow_update").html(lang_debug.update_available + ` <a href="#" id="mailcow_update_changelog">`+data.latest_tag+`</a>`);
+      $("#mailcow_update_changelog").click(function(){
+        if (mailcow_cc_role !== "admin" && mailcow_cc_role !== "domainadmin")
+          return;
 
-          showVersionModal("New Release " + latest_data.tag_name, latest_data.tag_name);
-        })
-      }
-    }).catch(err => {
-      // err
-      console.log(err);
-      $("#mailcow_update").removeClass("text-success text-warning").addClass("text-danger");
-      $("#mailcow_update").html("<b>"+ lang_debug.update_failed +"</b>");
-    });
+        showVersionModal("New Release " + data.latest_tag, data.latest_tag);
+      })
+    } else {
+      throw new Error(data.message || "update check failed");
+    }
   }).catch(err => {
     // err
     console.log(err);
diff --git a/data/web/js/site/mailbox.js b/data/web/js/site/mailbox.js
index 0a0192798..5ad5cceab 100644
--- a/data/web/js/site/mailbox.js
+++ b/data/web/js/site/mailbox.js
@@ -996,6 +996,7 @@ jQuery(function($){
               'style="min-width:2em;width:' + item.percent_in_use + '%">' + item.percent_in_use + '%' + '</div></div>'
             };
             item.username = escapeHtml(item.username);
+            item.name = escapeHtml(item.name);
 
             if (Array.isArray(item.tags)){
               var tags = '';
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/sogo-auth.php b/data/web/sogo-auth.php
index 07456a7d1..bc9694d8e 100644
--- a/data/web/sogo-auth.php
+++ b/data/web/sogo-auth.php
@@ -8,8 +8,12 @@ $ALLOW_ADMIN_EMAIL_LOGIN = (preg_match(
 $session_var_user_allowed = 'sogo-sso-user-allowed';
 $session_var_pass = 'sogo-sso-pass';
 
+// only the internal nginx auth_request loopback (127.0.0.1:65510) sets this;
+// external clients can never supply it (bare fastcgi param, not an HTTP header)
+$is_internal_auth = (($_SERVER['SOGO_AUTH_INTERNAL'] ?? '') === '1');
+
 // validate credentials for basic auth requests
-if (isset($_SERVER['PHP_AUTH_USER'])) {
+if ($is_internal_auth && isset($_SERVER['PHP_AUTH_USER'])) {
   // load prerequisites only when required
   require_once $_SERVER['DOCUMENT_ROOT'] . '/inc/prerequisites.inc.php';
 
@@ -50,6 +54,11 @@ elseif (isset($_GET['login'])) {
     (($_SESSION['acl']['login_as'] == "1" && $ALLOW_ADMIN_EMAIL_LOGIN !== 0) || ($is_dual === false && $login == $_SESSION['mailcow_cc_username']))) {
     if (filter_var($login, FILTER_VALIDATE_EMAIL)) {
       if (user_get_alias_details($login) !== false) {
+        // enforce tenant boundary
+        if (!hasMailboxObjectAccess($_SESSION['mailcow_cc_username'], $_SESSION['mailcow_cc_role'], $login)) {
+          header("Location: /");
+          exit;
+        }
         // Block SOGo access if pending actions (2FA setup, password update)
         if (!empty($_SESSION['pending_tfa_setup']) || !empty($_SESSION['pending_pw_update'])) {
           header("Location: /");
@@ -80,7 +89,7 @@ elseif (isset($_GET['login'])) {
   exit;
 }
 // only check for admin-login on sogo GUI requests
-elseif (isset($_SERVER['HTTP_X_ORIGINAL_URI']) && strcasecmp(substr($_SERVER['HTTP_X_ORIGINAL_URI'], 0, 9), "/SOGo/so/") === 0) {
+elseif ($is_internal_auth && isset($_SERVER['HTTP_X_ORIGINAL_URI']) && strcasecmp(substr($_SERVER['HTTP_X_ORIGINAL_URI'], 0, 9), "/SOGo/so/") === 0) {
   // this is an nginx auth_request call, we check for existing sogo-sso session variables
   require_once $_SERVER['DOCUMENT_ROOT'] . '/inc/vars.inc.php';
   if (file_exists($_SERVER['DOCUMENT_ROOT'] . '/inc/vars.local.inc.php')) {
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 30a7ba96b..4742fef17 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -84,7 +84,7 @@ services:
             - clamd
 
     rspamd-mailcow:
-      image: ghcr.io/mailcow/rspamd:4.1.0-1
+      image: ghcr.io/mailcow/rspamd:4.1.4-1
       stop_grace_period: 30s
       depends_on:
         - dovecot-mailcow
@@ -419,7 +419,7 @@ services:
         - php-fpm-mailcow
         - sogo-mailcow
         - rspamd-mailcow
-      image: ghcr.io/mailcow/nginx:1.30.3-1
+      image: ghcr.io/mailcow/nginx:1.30.4-1
       dns:
         - ${IPV4_NETWORK:-172.22.1}.254
       environment:
@@ -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: