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docs/requirements.md
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Before you run **mailcow: dockerized**, there are a few requirements that you should check:
- **WARNING**: When you want to run the dockerized version on your Debian 8 (Jessie) box you should [switch to the kernel 4.9 from jessie backports](https://packages.debian.org/jessie-backports/linux-image-amd64) because there is a bug (kernel panic) with the kernel 3.16 when running docker containers with *healthchecks*! For more details read: [github.com/docker/docker/issues/30402](https://github.com/docker/docker/issues/30402) and [forum.mailcow.email/t/solved-mailcow-docker-causes-kernel-panic-edit/448](https://forum.mailcow.email/t/solved-mailcow-docker-causes-kernel-panic-edit/448)
- Mailcow: dockerized requires [some ports](#default-ports) to be open for incomming connections, so make sure that your firewall is not bloking these. Also make sure that no other application is interferring with mailcow's configuration.
- A correct DNS setup is crucial to every good mailserver setup, so please make sure you got at least the [basics](dns/#the-minimal-dns-configuration) covered bevore you begin!
- Make sure that your system has a correct date and [time setup](#date-and-time). This is crucial for stuff like two factor TOTP authentication.
!!! warning
When you want to run the dockerized version on your Debian 8 (Jessie) box you should [switch to the kernel 4.9 from jessie backports](https://packages.debian.org/jessie-backports/linux-image-amd64) because there is a bug (kernel panic) with the kernel 3.16 when running docker containers with *healthchecks*! For more details read: [github.com/docker/docker/issues/30402](https://github.com/docker/docker/issues/30402) and [forum.mailcow.email/t/solved-mailcow-docker-causes-kernel-panic-edit/448](https://forum.mailcow.email/t/solved-mailcow-docker-causes-kernel-panic-edit/448)
!!! info
- Mailcow: dockerized requires [some ports](#default-ports) to be open for incomming connections, so make sure that your firewall is not bloking these. Also make sure that no other application is interferring with mailcow's configuration.
- A correct DNS setup is crucial to every good mailserver setup, so please make sure you got at least the [basics](dns/#the-minimal-dns-configuration) covered bevore you begin!
- Make sure that your system has a correct date and [time setup](#date-and-time). This is crucial for stuff like two factor TOTP authentication.
## Minimum System Resources