Install Mailcow in unraid


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I´m just evaluating unraid (I think I will buy a license :)). Currently I have a fully overpowered NAS with several virtual machines. My plan is to use a low power hardware in the future and ebay will take care of my old NAS.

Now I just tried to install Mailcow (my mail actual mail solution) with unraid but it was not that easy I expected:

docker-compose: Since the CA don´t have compose on board anymore I decided to use docker-compose as docker image with an alias (

Seems to do it´s job good :). Check.

The installation manual of mailcow ask to do clone the git repo to /opt/mailcow-dockerized

Since I learned unraid is unpacking every time in RAM and the only persistent volumes are /boot, /mnt/diskX and /mnt/cache “opt” would probably the wrong place to clone the repo to. I would need an additional data directory where the configuration and data is stored.


This is my point I´m a little bit stuck because I´m not sure which solution is the “unraid-way” to solve the problem:

·         Create the directories via ssh in /mnt/diskX ? Or is this per default a bad idea?

·         Create the directories with the gui?

Maybe I´m doing it totally wrong?

Some ppl are suggesting to use a VM to install Mailcow but I have a bad feeling to have a system with docker and all I need and create a VM to only host a mailsys into.


Thank you for your help in advance. Maybe someone is using mailcow already (I think @GuildDarts is using it this way too :)




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Sadly i'm no longer running mailcow (my new isp blocks port 25 :()
Bellow is what i did to install

cd /mnt/user/appdata
git clone
cd mailcow-dockerized

The only thing i changed in mailcow.conf was the http/https ports to 7080 and 7443. i also disabled ipv6

Hope you get it working ^_^
i do remember having issues with getting letsencrypt certs but got it working after some tinkering. Might have just been my setup

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1 hour ago, Gremmi said:

Since I learned unraid is unpacking every time in RAM and the only persistent volumes are /boot, /mnt/diskX and /mnt/cache “opt” would probably the wrong place to clone the repo to.

The usual way is a User Script to run at startup that copies from persistent storage to the OS folders in RAM. And if necessary, another to copy it back to persistent storage to maintain any updates.

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... and I´m back :)


What I have done


mkdir /opt/mailcow-dockerized
mkdir /mnt/user/appdata/mailcow/mailcow-dockerized

mount --bind /opt/mailcow-dockerized /mnt/user/appdata/mailcow/mailcow-dockerized

cd /opt
git clone
cd mailcow-dockerized


I started the containers (one failed but my fault .. wrong config). I restarted unraid .... aaaaaaaaand: Everything is gone :o


"/opt/mailcow-dockerized" => OK because it has to be mounted manually (later via go script) but what I really don´t understand: Why is the folder "/mnt/user/appdata/mailcow/mailcow-dockerized" empty?!?


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  • 2 months later...
On 9/3/2020 at 8:49 PM, GuildDarts said:

Just git clone inside /mnt/user/appdata you dont have to install it in /opt

Hi, I installed mailcow in the virtual machine Ubuntu. Now I want to put it on Unraid. To do this, I decided to create templates for all 18 containers. I have little experience, so immediately there is a question.
As denoted in Unraid,  :z, :Z, :ro,Z in mount folder?

      image: mailcow/unbound:1.12
        - TZ=${TZ}
        - ./data/hooks/unbound:/hooks:Z
        - ./data/conf/unbound/unbound.conf:/etc/unbound/unbound.conf:ro,Z

Edited by muwahhid
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