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The minimum hardware requirements for GFI MailEssentials are:


  • Minimum: 1Ghz
  • Recommended: 2GHz with multiple cores

Available memory (RAM)

  • Minimum: 1.2GB
  • Recommended: 1.5GB

Free disk space

  • Minimum: 6GB
  • Recommended: 10GB


Hardware requirements depend on a range of factors including email volume, and number of Anti Virus engines enabled in GFI MailEssentials. The requirements specified above are required for GFI MailEssentials only.


  • Microsoft Windows Server 2003 (x86/x64) or later
  • Microsoft IIS SMTP service or Exchange Server 2003/2007*/2010/2013/2016 (*SP1 or later for Exchange 2007)
  • Microsoft IIS World Wide Web service
  • Microsoft Messaging Queuing Service (MSMQ)
  • Microsoft .NET Framework 4/4.5
  • ASP.NET & Windows Authentication role services when installing on Windows Server 2008
  • Microsoft SQL Server/Microsoft SQL Server Express (free) is suggested for the Reporting engine database for installs with more than 100 mailboxes.


  • For more information how to install pre-requisites on Windows Server 2008 refer to:
  • For more information how to install pre-requisites on Windows Server 2012 refer to:
  • GFI MailEssentials Information Store Scanning (VSAPI) cannot be used if any other software is registered to make use of Microsoft Exchange VSAPI.
  • GFI MailEssentials can also be installed in virtual environments such as Microsoft Hyper-V and VMWare virtualization software.

Antivirus and backup software

Antivirus and backup software scanning may cause GFI MailEssentials to malfunction. This occurs when such software denies access to certain files required by GFI MailEssentials.

Disable third party antivirus and backup software from scanning the following folders:

32-bit installations (x86) 64-bit installations (x64)
<..\Program Files\Common Files\GFI> <..\Program Files (x86)\Common Files\GFI>
<GFI MailEssentials installation path>\GFI\MailEssentials\
<..\Inetpub\mailroot> - if installed on a gateway machine.
<..\Program Files\Exchsrvr\Mailroot> - if installed on the same machine as Microsoft Exchange 2000/2003
<..\Program Files\Microsoft\Exchange Server\TransportRoles> - if installed on the same machine as Microsoft Exchange 2007
<..\Program Files\Microsoft\Exchange Server\V14\TransportRoles> - if installed on the same machine as Microsoft Exchange 2010
<..\Program Files\Microsoft\Exchange Server\V15\TransportRoles> - if installed on the same machine as Microsoft Exchange 2013/2016

Firewall port settings

Configure your firewall to allow the ports used by GFI MailEssentials.

Port Description
53 - DNS

Used by the following anti-spam filters:

  • IP DNS Blocklist
  • SpamRazer
  • URI DNS Blocklist
20 & 21 - FTP Used by GFI MailEssentials to connect to and retrieve latest product version information.
80 - HTTP

Used by GFI MailEssentials to download product patches updates for:

  • SpamRazer
  • Anti-Phishing
  • Bayesian Analysis
  • Antivirus definition files
  • Trojan and executable scanner
  • Email Exploit engine

GFI MailEssentials downloads from the following locations:

  • *
  • *

GFI MailEssentials can also be configured to download updates through a proxy server.

8015, 9091, 9093 - Remoting These ports are used for inter-process communication. No firewall configuration is required to allow connections to or from the remoting ports since all the GFI MailEssentials processes run on the same server.
Ensure that no other applications (except GFI MailEssentials) are listening on these ports. If other applications are using this ports, these ports can be changed.
389/636 - LDAP/LDAPS

This port is used in these scenarios:

  • Microsoft Exchange environment - Required if the server running GFI MailEssentials does not have access/cannot get list of users from Active Directory, for example, in a DMZ environment or other environments which do not use Active Directory.
  • Lotus Domino mail server environment - Required to get email addresses from Lotus Domino server.
  • Other SMTP mail server environments - Required to get email addresses from SMTP server.

GFI MailEssentials SpamTag for Microsoft Outlook Requirements 



  • Minimum: 1Ghz

Available memory (RAM)

  • Minimum: 512MB
  • Recommended: 2GB

Free disk space

  • 50MB physical storage dedicated for SpamTag


Required components

  • Microsoft .NET Framework 4/4.5

Supported operating systems

  • Windows® 10
  • Windows® 8/8.1
  • Windows® 7
  • Windows® Vista
  • Windows® XP
  • Windows® Server 2012/R2
  • Windows® Server 2008/R2
  • Windows® Server 2003

Supported Microsoft Outlook® Versions

  • Microsoft Outlook® 2016 (x86 and x64 versions)
  • Microsoft Outlook® 2013 (x86 and x64 versions)
  • Microsoft Outlook® 2010 (x86 and x64 versions; Service Packs 1 or 2)
  • Microsoft Outlook® 2007 (Service Packs 1 or 2)
  • Microsoft Outlook® 2003 (Service Packs 1, 2, 3 or 4)

Connection with GFI MailEssentials

SpamTag connects with GFI MailEssentials on port 80 over HTTP. To confirm connection, from the client's browser ensure that you can open the GFI MailEssentials URL.