added warning message for PERMIT_DOCKER=network when using IPv6 (dock…

…er-mailserver#1405)
polarathene · Sep 27, 2020 · 53d8bdf · 53d8bdf
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diff --git a/website/docs/FAQ-and-Tips.md b/website/docs/FAQ-and-Tips.md
@@ -270,6 +270,8 @@ Please note that clamav can consume a lot of memory, as it reads the entire sign
 
 Yes, by Adding the Environment Variable `PERMIT_DOCKER: network`.
 
+**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))
+
 ### How can I authenticate users with SMTP_ONLY?
 
 See https://github.com/tomav/docker-mailserver/issues/1247 for an example.