After purchasing ESET Mail Security, the installer can be downloaded from ESET’s website ( as an .msi package.

note_icon_note NOTE

If you have previously used other third-party antivirus software on your system, we recommend that you uninstall it completely prior to the installation of ESET Mail Security. You can use ESET AV Remover to assist in the removal of third-party software.

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

note_icon_important IMPORTANT

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

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.

note_icon_important IMPORTANT

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.

To install ESET Mail Security, you have two installation modes to choose from. Using an installation wizard (GUI) or a command line installation.

Installation wizard:

This is a typical GUI installation mode. Double-click the .msi package to run the installation wizard and choose desired installation type.

hmtoggle_plus1Complete or Typical

Command line installation:

In addition to the installation wizard, you can choose to install ESET Mail Security silently via command line. This installation type does not require any interaction and is also referred to as an unattended installation.

hmtoggle_plus1Silent / Unattended installation