- [ ] I have understood that answers are voluntary and community-driven, and not commercial support.
- [ ] I have verified that my issue has not been already answered in the past. I also checked previous [issues](https://github.com/mailcow/mailcow-dockerized/issues).
Please take a look at the [official documentation](https://mailcow.github.io/mailcow-dockerized-docs/debug-logs/) and post the last few lines of logs, when the error occurs.
- Output of `git diff origin/master`, any other changes to the code? If so, **please post them**.
- All third-party firewalls and custom iptables rules are unsupported. *Please check the Docker docs about how to use Docker with your own ruleset*. Nevertheless, iptabels output can help us to help you: `iptables -L -vn`, `ip6tables -L -vn`, `iptables -L -vn -t nat` and `ip6tables -L -vn -t nat`.
- DNS problems? Please run `docker exec -it $(docker ps -qf name=acme-mailcow) dig +short stackoverflow.com @172.22.1.254` (set the IP accordingly, if you changed the internal mailcow network) and post the output.