DNS blackhole and excessive memory consumption

[Sonic]

On Wed, Apr 17, 2019 at 9:01 AM Andrea via Unbound-users
<unbound-users at nlnetlabs.nl> wrote:
..
> I've implemented my blackhole using the directive "local-zone", basically making unbound authoritative for those malicious/unwanted domains, i.e.:
>
> local-zone: "spam.com" redirect
> local-data: "spam.com A 0.0.0.0"

Instead of the above try:
local-zone: "example.com." always_nxdomain

Chris