* Bastian Blank <bastian+postfix-users=postfix....@waldi.eu.org> [170322 15:09]: > Moin > > On Wed, Mar 22, 2017 at 01:04:36PM -0400, Marvin Renich wrote: > > Mar 21 14:42:45 basil postfix/smtp[12587]: 3AF35240229: > > to=<recipie...@host2.example2.com>, relay=none, delay=0.47, > > delays=0.25/0.22/0/0, dsn=4.4.3, status=deferred (Host or domain name not > > found. Name service error for name=florina.renich.org type=AAAA: Host not > > found, try again) > > I looked that error up and I'm not sure if I found everything. > > - "Host not found, try again" is TRY_AGAIN, according to > src/dns/dns_strerror.c. > - This error is only produced if res_send produced an error, or if the > lookup explicitely gets a SERVFAIL. > > So this message should only show up if something is already pretty wrong > with DNS. If there is no network it will show up for example.
Thanks for looking at this, Bastian. Is there any reason you can think of that res_send would fail for Postfix, but other programs, such as host, would get a correct response? For example, if Postfix calls res_init, which gets a bad value from resolv.conf, like for a temporary network outage, then Postfix continues to run for days, not requiring any dns services. Meanwhile, the temporary outage is short-lived, but Postfix never gets the word. Other programs work, but Postfix continues to get dns failures because res_init was called at a time when resolv.conf was bad? ...Marvin
