MCIF_TLS
usetls = bitset(MCIF_TLS, mci->mci_flags);
mci->mci_flags &= ~MCIF_TLS;
{ MCIF_TLS, "TLS" },
#define MCIF_EXTENS (MCIF_EXPN | MCIF_SIZE | MCIF_8BITMIME | MCIF_DSN | MCIF_8BITOK | MCIF_AUTH | MCIF_ENHSTAT | MCIF_TLS)
mci->mci_flags |= MCIF_TLS;