Preparing for installation

There are a few steps we recommend you to take in preparation of the product installation:

After purchasing ESET Mail Security, download .msi installation package from ESET’s website exlink.

Make sure that the server on which you plan to install ESET Mail Security meets system requirements.

Log on to the server using an Administrator account.


Please note that you must to execute the installer using the Built-in Administrator account or a domain Administrator account (in the event that local Administrator account is disabled). Any other user, despite being a member of Administrators group, will not have sufficient access rights. Therefore you need to use the Built-in Administrator account, as you will not be able to successfully complete installation under any other user account than local or domain Administrator.


Before installing and uninstalling ESET Mail Security it's necessary to shut down your IBM Domino server.

If you are going to do an upgrade from an existing installation of ESET Mail Security, we recommend you to backup its current configuration using the Export settings feature.

Remove /uninstall any third-party antivirus software from your system, if applicable. We recommend that you use the ESET AV Remover exlink. For a list of third-party antivirus software that can be removed using ESET AV Remover, see this KB article exlink.

If you are installing ESET Mail Security on Windows Server 2016, Microsoft recommends exlink to uninstall exlink Windows Defender Features and withdraw from Windows Defender ATP enrollment to prevent problems caused by having multiple antivirus products installed on a machine.

If you are installing ESET Mail Security on Windows Server 2019, Microsoft recommends exlink putting Windows Defender into the passive mode to prevent problems caused by having multiple antivirus products installed on a machine.

You can check the number of mailboxes by running the Mailbox Count tool, see Mailbox count for information how to use the tool. Once your ESET Mail Security is installed, it will display current mailbox count at the bottom of the Monitoring window.


You can run ESET Mail Security installer in two installation modes:

Graphical user interface (GUI)
This is the recommended installation type in a from of an installation wizard.

Silent / Unattended installation
In addition to the installation wizard, you can choose to install ESET Mail Security silently via command line.


We highly recommend installing ESET Mail Security on a freshly installed and configured OS, if possible. If you do need to install it on an existing system, we recommend that you uninstall the version of ESET Mail Security, restart the server and install the new ESET Mail Security afterwards.

Upgrading to a newer version
If you are using an older version of ESET Mail Security, you can choose suitable upgrade method.


After you've successfully installed or upgraded your ESET Mail Security, further activities are:

Product activation
Availability of a particular activation scenario in the activation window may vary depending on the country, as well as the means of distribution.

Configuring server protection
You can fine-tune your ESET Mail Security by modifying advanced settings of each of its features to suite on your needs.