Update i_u_m_install.md

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André Peters 2020-05-15 22:20:53 +02:00 committet von GitHub
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!!! warning
Make sure you've read ["Prepare Your System"](https://mailcow.github.io/mailcow-dockerized-docs/prerequisite-system) before proceeding!
**Do not** use CentOS 8 with Centos 7 Docker packages. You may create an open relay.
You need Docker and Docker Compose.