F_TLS_VERIFY
listen_opts.ssl = F_SMTPS|F_TLS_VERIFY;
listen_opts.ssl = F_STARTTLS|F_STARTTLS_REQUIRE|F_TLS_VERIFY;
if (lo->ssl & F_TLS_VERIFY)
h->flags |= F_TLS_VERIFY;
if (l->flags & F_TLS_VERIFY)
if (s->listener->flags & F_TLS_VERIFY)