> On Sep 13, 2018, at 6:11 PM, Alex <mysqlstud...@gmail.com> wrote:
>
> Hi, I've been experiencing these weird "Name service error" problems
> for a month or so and can't figure out what's causing them.
>
> Sep 13 10:04:59 mail03 postfix/dnsblog[30902]: warning: dnsblog_query:
> lookup error for DNS query 25.188.223.216.b.barracudacentral.org: Host
> or domain name not found. Name service error for
> name=25.188.223.216.b.barracudacentral.org type=A: Host not found, try
> again
Your resolver cannot resolve the address and returns SERVFAIL. Perhaps
the RBLs you're using are no longer willing to process your queries.
The traffic of interest is not between Postfix and your resolver, but
between your resolver and various nameservers on the public Internet.
--
Viktor.
