mailcow-dockerized-docs/docs/manual-guides/Unbound/u_e-unbound-fwd.en.md

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If you want or have to use an external DNS service, you can either set a forwarder in Unbound or copy an override file to define external DNS servers:
!!! warning
Please do not use a public resolver like we did in the example above. Many - if not all - blacklist lookups will fail with public resolvers, because blacklist server has limits on how much requests can be done from one IP and public resolvers usually reach this limits.
**Important**: Only DNSSEC validating DNS services will work.
## Method A, Unbound
Edit `data/conf/unbound/unbound.conf` and append the following parameters:
```
forward-zone:
name: "."
forward-addr: 8.8.8.8 # DO NOT USE PUBLIC DNS SERVERS - JUST AN EXAMPLE
forward-addr: 8.8.4.4 # DO NOT USE PUBLIC DNS SERVERS - JUST AN EXAMPLE
```
Restart Unbound:
```
docker-compose restart unbound-mailcow
```
## Method B, Override file
```
cd /opt/mailcow-dockerized
cp helper-scripts/docker-compose.override.yml.d/EXTERNAL_DNS/docker-compose.override.yml .
```
Edit `docker-compose.override.yml` and adjust the IP.
Run `docker-compose down ; docker-compose up -d`.