Christoph Rudorff via Postfix-users:
> Hello list,
>
> yes, I ran into the problem, that Spamhaus stopped supporting public DNS
> resolvers:
>
> Service unavailable; Client host [xxxx::] blocked using zen.spamhaus.org;
> Error: open resolver;
That is not new. Their free service does not allow queries from
open resolvers (or other sources that would exceed the free limit).
> Please update the documentation [1] about smtpd_recipient_restrictions:
>
> reject_rbl_client zen.spamhaus.org=127.0.0.[2..11]
> ... etc
> [2]
>
> and drop a bold warning not to use a public DNS!
I can add a note,
For email servers, it has always been best practice to run a local
resolver that queries the internet directly, instead of a resolver
that forwards queries to some ISP and that targets consumer devices.
Wietse
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