diff --git a/application/Espo/Core/Mail/Account/Storage/LaminasStorage.php b/application/Espo/Core/Mail/Account/Storage/LaminasStorage.php
index 58684d1cc2..20a4f4b116 100644
--- a/application/Espo/Core/Mail/Account/Storage/LaminasStorage.php
+++ b/application/Espo/Core/Mail/Account/Storage/LaminasStorage.php
@@ -125,6 +125,10 @@ class LaminasStorage implements Storage
 
     public function appendMessage(string $content, ?string $folder = null): void
     {
+        if ($folder !== null) {
+            $folder = mb_convert_encoding($folder, 'UTF7-IMAP', 'UTF-8');
+        }
+
         $this->imap->appendMessage($content, $folder);
     }
 }