markfailure
markfailure(e, to, NULL, EX_UNAVAILABLE, false);
markfailure(e, to, NULL, rcode, ovr);
markfailure(e, to, NULL, rcode, true);
markfailure(e, to, mci, i, false);
markfailure(e, to, mci, i, false);
markfailure(e, to, mci, rcode, true);
markfailure(e, to, mci, rcode, true);
extern void markfailure __P((ENVELOPE *, ADDRESS *, MCI *, int, bool));
markfailure(e, mci->mci_nextaddr, mci, r, false);
markfailure(e, mci->mci_nextaddr, mci, r,