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,
         );

lib/Service/Remote/RemoteMailService.php

@@ -1007,11 +1007,14 @@ class RemoteMailService {
 	}
 
 	/**
-	 * Submit an existing draft message.
+	 * Submit an existing draft message. On success, the draft Email is moved
+	 * from the drafts mailbox to the sent mailbox and its \Draft keyword is
+	 * cleared in the same request, so the submitted draft becomes the sent
+	 * copy rather than lingering as an unsent draft.
 	 *
 	 * @since Release 2.0.0
 	 */
-	public function entitySubmitDraft(string $identityId, string $draftId, ?array $patch = null, array $attachments = []): string {
+	public function entitySubmitDraft(string $identityId, string $draftId, string $preSendTarget, string $postSentTarget, ?array $patch = null, array $attachments = []): string {
 		if ($draftId === '') {
 			throw new Exception('Draft identifier is required for draft submission', 1);
 		}
@@ -1029,6 +1032,11 @@ class RemoteMailService {
 
 		$submissionId = 's_' . uniqid();
 		$r1 = new MailSubmissionSet($this->dataAccount, null, $this->resourceNamespace, $this->resourceEntityLabel);
+		$r1->completionUpdate($draftId, [
+			'mailboxIds/' . $postSentTarget => true,
+			'mailboxIds/' . $preSendTarget => null,
+			'keywords/$draft' => null,
+		]);
 		$s0 = $r1->create($submissionId);
 		$s0->identity($identityId);
 		$s0->message($draftId);