removed unnecessary mailbox disconnect

src/Service/MailFetcher.php

@@ -64,8 +64,6 @@ readonly class MailFetcher
                 $this->logger->debug("Skipped mail with id=" . $mailId);
             }
         }
-
-        $mailbox->disconnect();
     }
 
     private function canProcessMail(IncomingMail $mail): bool