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added warning message for PERMIT_DOCKER=network when using IPv6 (#1405)

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Georg Lauterbach 2020-09-27 22:15:21 +02:00
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docs/content/tutorials/installation-examples.md
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## Building a simple mailserver
**WARNING**: Adding the docker network's gateway to the list of trusted hosts, e.g. using the `network` or `connected-networks` option, can create an [**open relay**](https://en.wikipedia.org/wiki/Open_mail_relay), [for instance](https://github.com/tomav/docker-mailserver/issues/1405#issuecomment-590106498) if IPv6 is enabled on the host machine but not in Docker. ([#1405](https://github.com/tomav/docker-mailserver/issues/1405))
We are going to use this docker based mailserver:
- First create a directory for the mailserver and get the setup script: