diff --git a/data/web/inc/lib/mailcow/Archive/Model/Mailbox.php b/data/web/inc/lib/mailcow/Archive/Model/Mailbox.php
index 41575c6e2..7fdc62d67 100644
--- a/data/web/inc/lib/mailcow/Archive/Model/Mailbox.php
+++ b/data/web/inc/lib/mailcow/Archive/Model/Mailbox.php
@@ -34,9 +34,10 @@ class Mailbox
         );
     }
 
-    /** Mailbox setting as stored: '1', '0', anything else (also a missing attribute) is 'inherit' */
+    /** Mailbox setting: '1', '0' (also as number or boolean), anything else (also a missing attribute) is 'inherit' */
     public static function setting(mixed $value): string
     {
+        $value = is_bool($value) ? (int)$value : $value;
         $value = is_scalar($value) ? (string)$value : '';
         return in_array($value, ['0', '1'], true) ? $value : self::INHERIT;
     }
diff --git a/tests/php/Archive/Model/MailboxTest.php b/tests/php/Archive/Model/MailboxTest.php
index 954788b84..49d0937d6 100644
--- a/tests/php/Archive/Model/MailboxTest.php
+++ b/tests/php/Archive/Model/MailboxTest.php
@@ -28,6 +28,8 @@ class MailboxTest extends TestCase
             'on as number' => [1, 0, true],
             'off' => ['0', 1, false],
             'off as number' => [0, 1, false],
+            'on as boolean' => [true, 0, true],
+            'off as boolean' => [false, 1, false],
         ];
     }