diff --git a/data/web/inc/functions.mailbox.inc.php b/data/web/inc/functions.mailbox.inc.php
index 30eae5b6..dca40a75 100644
--- a/data/web/inc/functions.mailbox.inc.php
+++ b/data/web/inc/functions.mailbox.inc.php
@@ -1935,6 +1935,23 @@ function mailbox($_action, $_type, $_data = null, $_extra = null) {
               continue;
             }
             if ($_data['expand_alias'] === true || $_data['expand_alias'] == 1) {
+              $stmt = $pdo->prepare("SELECT `address` FROM `alias`
+                WHERE `address` = :address
+                  AND `domain` NOT IN (
+                    SELECT `alias_domain` FROM `alias_domain`
+                  )");
+              $stmt->execute(array(
+                ':address' => $address,
+              ));
+              $num_results = count($stmt->fetchAll(PDO::FETCH_ASSOC));
+              if ($num_results == 0) {
+                $_SESSION['return'][] = array(
+                  'type' => 'warning',
+                  'log' => array(__FUNCTION__, $_action, $_type, $_data_log, $_attr),
+                  'msg' => array('is_not_primary_alias', htmlspecialchars($address))
+                );
+                continue;
+              }
               $stmt = $pdo->prepare("SELECT `goto`, GROUP_CONCAT(CONCAT(SUBSTRING(`alias`.`address`, 1, LOCATE('@', `alias`.`address`) - 1), '@', `alias_domain`.`alias_domain`)) AS `missing_alias`
                 FROM `alias` JOIN `alias_domain` ON `alias_domain`.`target_domain` = `alias`.`domain`
                     WHERE CONCAT(SUBSTRING(`alias`.`address`, 1, LOCATE('@', `alias`.`address`) - 1), '@', `alias_domain`.`alias_domain`) NOT IN (
diff --git a/data/web/js/site/mailbox.js b/data/web/js/site/mailbox.js
index ace75d49..6f1cb8d5 100644
--- a/data/web/js/site/mailbox.js
+++ b/data/web/js/site/mailbox.js
@@ -772,7 +772,7 @@ jQuery(function($){
         {"name":"domain","title":lang.domain,"breakpoints":"xs sm"},
         {"name":"public_comment","title":lang.public_comment,"breakpoints":"all"},
         {"name":"private_comment","title":lang.private_comment,"breakpoints":"all"},
-        {"name":"sogo_visible","title":lang.sogo_visible,"breakpoints":"all"},
+        {"name":"sogo_visible","title":lang.sogo_visible,"formatter": function(value){return 1==value?'✓':0==value&&'✕';},"breakpoints":"all"},
         {"name":"active","filterable": false,"style":{"maxWidth":"80px","width":"80px"},"title":lang.active,"formatter": function(value){return 1==value?'✓':0==value&&'✕';}},
         {"name":"action","filterable": false,"sortable": false,"style":{"text-align":"right","maxWidth":"180px","width":"180px"},"type":"html","title":lang.action,"breakpoints":"xs sm"}
       ],
diff --git a/data/web/lang/lang.de.json b/data/web/lang/lang.de.json
index c4e5205d..f35a0738 100644
--- a/data/web/lang/lang.de.json
+++ b/data/web/lang/lang.de.json
@@ -1110,6 +1110,7 @@
         "fuzzy_learn_error": "Fuzzy Lernfehler: %s",
         "hash_not_found": "Hash nicht gefunden. Möglicherweise wurde dieser bereits gelöscht.",
         "ip_invalid": "Ungültige IP übersprungen: %s",
+        "is_not_primary_alias": "Überspringe nicht-primären Alias %s",
         "no_active_admin": "Kann letzten aktiven Administrator nicht deaktivieren",
         "quota_exceeded_scope": "Domain-Quota erschöpft: Es können nur noch unlimiterte Mailboxen in dieser Domain erstellt werden.",
         "session_token": "Formular-Token ungültig: Token stimmt nicht überein",
diff --git a/data/web/lang/lang.en.json b/data/web/lang/lang.en.json
index 737faf90..981979d2 100644
--- a/data/web/lang/lang.en.json
+++ b/data/web/lang/lang.en.json
@@ -1108,6 +1108,7 @@
         "fuzzy_learn_error": "Fuzzy hash learn error: %s",
         "hash_not_found": "Hash not found or already deleted",
         "ip_invalid": "Skipped invalid IP: %s",
+        "is_not_primary_alias": "Skipped non-primary alias %s",
         "no_active_admin": "Cannot deactivate last active admin",
         "quota_exceeded_scope": "Domain quota exceeded: Only unlimited mailboxes can be created in this domain scope.",
         "session_token": "Form token invalid: Token mismatch",