First, perform the steps of the Standalone Solution to ensure a container with exported emails from the Securepoint UMA is available.
To do this, install the current ISO on a supported environment.
After installation, you need an EVAL license to register the appliance (create an account on my.reddoxx.com and use the Link to request an EVAL license):
A detailed installation video can be found here:
https://appliance-2034-admin.docs.reddoxx.com/en/installation/installationsteps
After installing the REDDOXX Appliance, only a few steps are necessary to access the email archive.

In the case of a Local Disc, this storage must then be formatted via right-click => Advanced.
Other storage types as well as their setup and use are described here:
https://appliance-2034-admin.docs.reddoxx.com/en/configuration/storages
Set up a share via Configuration => Network => SMB / CIFS so that the added storage is accessible on the network

Close and remove the container from the Toolbox to prevent duplicate accesses from blocking the process:

Copy the container via the created share to the REDDOXX Appliance.
In the appliance, go to Maildepot => Settings and activate the MailDepot archiving:

In MailDepot => Archive Container, you can now open the copied container via "Add" (select the path of the container and open the container via the reddoxx.rdxacs file).
For users to also access via the user interface, user accounts are now required.
The easiest and fastest way is to use AD synchronization using a Realm.
Realms are created under Administration => User and Groups => Realms via add.
This is described in detail in the Admin Manual and depends on whether and which directory services are available to you.
As soon as the login Realm, respectively the users and their email addresses, are present in the appliance, users can log in, for example, via the web interface (https://ApplianceIP/user) and search for emails that correspond to their associated email aliases (note that initially, for performance reasons, only the last few days of archived emails are displayed, but a search then runs across the entire archive).
Now the appliance can also be used for permanent archiving of new emails; for this, operation in the mailflow would be suitable on the one hand (in which the REDDOXX Appliance automatically archives emails transported through it) or alternatively the use of a journaling rule (provided the currently used email server supports this).
The entire documentation can be found at:
https://appliance-2034-admin.docs.reddoxx.com/
There, the individual modules (Spamfinder / MailSealer / MailDepot), Quick Guides, Release Notes and Quick Guides for the initial setup are listed.