----- Original Message -----
> Jaroslav Skarvada:
> > Hi,
> >
> > it seems the resolver was rewritten (probably in postfix 3.1.x), but
> > it seems it now uses res_query instead of the res_search which results
> > in RES_DEFNAMES and RES_DNSRCH not supported with smtp_host_lookup=dns,
>
> This is indeed the result of a mistake that I introduced in Postfix
> 3,1 when I added support for negative response TTLs in postscreen.
>
> With the patch below, the Postfix dns library still passes all
> tests, including the tests for negative caching.
>
> Wietse
>
> --- /var/tmp/postfix-3.5-20191109/src/dns/dns_lookup.c 2019-05-05
> 10:47:40.000000000 -0400
> +++ src/dns/dns_lookup.c 2019-12-14 19:19:03.000000000 -0500
> @@ -399,7 +399,7 @@
> if (keep_notfound)
> /* Prepare for returning a null-padded server reply. */
> memset(answer, 0, anslen);
> - len = res_query(name, class, type, answer, anslen);
> + len = res_search(name, class, type, answer, anslen);
> /* Begin API creep workaround. */
> if (len < 0 && h_errno == 0) {
> SET_H_ERRNO(TRY_AGAIN);
>
>
Hi Wietse,
thanks for info. Are you going to introduce this patch upstream?
thanks & regards
Jaroslav
