diff --git a/src/Symfony/Component/Mailer/Bridge/Postmark/RemoteEvent/PostmarkPayloadConverter.php b/src/Symfony/Component/Mailer/Bridge/Postmark/RemoteEvent/PostmarkPayloadConverter.php
index 6463c0e2a209c..9fd8cea6ac58e 100644
--- a/src/Symfony/Component/Mailer/Bridge/Postmark/RemoteEvent/PostmarkPayloadConverter.php
+++ b/src/Symfony/Component/Mailer/Bridge/Postmark/RemoteEvent/PostmarkPayloadConverter.php
@@ -52,8 +52,13 @@ public function convert(array $payload): AbstractMailerEvent
         }
         $event->setDate($date);
         $event->setRecipientEmail($payload['Recipient'] ?? $payload['Email']);
-        $event->setMetadata($payload['Metadata']);
-        $event->setTags([$payload['Tag']]);
+
+        if (isset($payload['Metadata'])) {
+            $event->setMetadata($payload['Metadata']);
+        }
+        if (isset($payload['Tag'])) {
+            $event->setTags([$payload['Tag']]);
+        }
 
         return $event;
     }
diff --git a/src/Symfony/Component/Mailer/Bridge/Postmark/Webhook/PostmarkRequestParser.php b/src/Symfony/Component/Mailer/Bridge/Postmark/Webhook/PostmarkRequestParser.php
index 4b91cc07daa39..03326a697087f 100644
--- a/src/Symfony/Component/Mailer/Bridge/Postmark/Webhook/PostmarkRequestParser.php
+++ b/src/Symfony/Component/Mailer/Bridge/Postmark/Webhook/PostmarkRequestParser.php
@@ -48,8 +48,6 @@ protected function doParse(Request $request, #[\SensitiveParameter] string $secr
             !isset($payload['RecordType'])
             || !isset($payload['MessageID'])
             || !(isset($payload['Recipient']) || isset($payload['Email']))
-            || !isset($payload['Metadata'])
-            || !isset($payload['Tag'])
         ) {
             throw new RejectWebhookException(406, 'Payload is malformed.');
         }