diff --git a/api.php b/api.php
index db1f04b..a34ca73 100644
--- a/api.php
+++ b/api.php
@@ -305,16 +305,22 @@ class ZammadClient {
 
     /** Lähetä vastaus tikettiin */
     public function createArticle(int $ticketId, string $body, string $to = '', string $subject = '', string $type = 'email'): array {
+        // Muunna plain-text HTML:ksi jos body ei sisällä HTML-tageja
+        $htmlBody = $body;
+        if (strip_tags($body) === $body) {
+            $htmlBody = nl2br(htmlspecialchars($body, ENT_QUOTES, 'UTF-8'));
+        }
         $data = [
             'ticket_id' => $ticketId,
-            'body' => $body,
+            'body' => $htmlBody,
             'content_type' => 'text/html',
             'type' => $type,
+            'subtype' => 'reply',
             'internal' => false,
             'sender' => 'Agent',
         ];
         if ($to) $data['to'] = $to;
-        if ($subject) $data['subject'] = $subject;
+        if ($subject) $data['subject'] = 'Re: ' . preg_replace('/^Re:\s*/i', '', $subject);
         return $this->request('POST', 'ticket_articles', $data);
     }