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