[stable3.7] fix: outbox message not being cleared after retry

Signed-off-by: SebastianKrupinski <krupinskis05@gmail.com>

Author: SebastianKrupinski

lib/Service/MailTransmission.php

@@ -157,6 +157,7 @@ public function sendMessage(Account $account, LocalMessage $localMessage): void
 			//        However, the headers are taken from the base part and always indicate the 8bit
 			//		  encoding.
 			$localMessage->setRaw(stream_get_contents($mail->getRaw(true)));
+			$localMessage->setStatus(LocalMessage::STATUS_RAW);
 		} catch (Horde_Mime_Exception $e) {
 			$this->logger->error($e->getMessage(), ['exception' => $e]);
 			if (in_array($e->getCode(), self::RETRIABLE_CODES, true)) {