Used by the following anti-spam filters:

• IP DNS Blocklist
• SpamRazer
• URI DNS Blocklist

Used by GFI MailEssentials to download product patches and updates for:

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

GFI MailEssentials downloads from the following locations:

• meupdate.gfi.com
• support.gfi.com
• *.mailshell.net
• *.rules.mailshell.net
• spamrazer.gfi.com
• db11.spamcatcher.net
• gfi-downloader-137146314.us-east-1.elb.amazonaws.com
• cdnupdate.gfi.com
• cdnpatches.gfi.com

NOTE: GFI MailEssentials can also be configured to download updates through a proxy server. For more information refer to Proxy settings.

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.

NOTE: 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. For more information refer to Remoting ports.

This port is used in these scenarios:

• Remote Active Directory mode - When the GFI MailEssentials server is not joined to an Active Directory domain, but retrieves the list of users from a remote Active Directory instance.
• GFI Directory mode - When the GFI MailEssentials server is not joined to an Active Directory domain, but retrieves the list of users from GFI Directory instance.
• Microsoft^® Exchange environment - Required if the server running GFI MailEssentials does not have access to or 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.