fix: move draft to sent and clear draft flag on submission

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

lib/Providers/Mail/Service.php

@@ -950,6 +950,23 @@ class Service implements ServiceBaseInterface, ServiceMutableInterface, ServiceC
             );
         }
 
+        // determine the sent folder
+        // if no explicit sent folder is configured, we will attempt to find a folder with the "sent" role.
+        $postSentTarget = $this->auxiliary['sentTarget'] ?? null;
+        $postSentTarget = $postSentTarget !== null && (string) $postSentTarget !== ''
+            ? new CollectionIdentifier($this->provider(), (string) $this->identifier(), (string) $postSentTarget)
+            : $this->resolveCollectionByRole(CollectionRoles::Sent->value);
+
+        if ($postSentTarget === null
+            || $postSentTarget->provider() !== $this->provider()
+            || $postSentTarget->service() !== (string)$this->identifier()) {
+            return new EntitySubmitResult(
+                EntitySubmitResult::DISPOSITION_ERROR,
+                errorCode: 'sent_collection_not_found',
+                errorMessage: 'No Sent target collection is configured or could be resolved for this service',
+            );
+        }
+
         if ($message !== null) {
             [$nativeMessage, $nativeAttachments] = $this->messagePayload($message);
         } else {
@@ -960,6 +977,8 @@ class Service implements ServiceBaseInterface, ServiceMutableInterface, ServiceC
         $transportId = $this->mailService->entitySubmitDraft(
             $identityId,
             (string)$source->entity(),
+            (string)$source->collection(),
+            $postSentTarget->collection(),
             $nativeMessage,
             $nativeAttachments,
         );