comment something that always fails with nondescriptive error message

src/pEpTransportMail.cc

@@ -186,7 +186,7 @@ namespace pEp {
             // if nothing failed, pep_tsc is still PEP_tsc_message_on_the_way
             cb_sendto_result(get_id(), msg->id, pep_tsc);
             try {
-                conn_imap->append("Sent", mmsg);
+                //conn_imap->append("Sent", mmsg);
                 // This usually fails in the test, I don't know why.
                 // And I'm not even sure if it's a) needed or b) even asked for?
             } catch (mailio::imap_error e) {