These ports are used for inter-process communication. No firewall configuration is required to allow connections to or from the remote 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 these ports, they can be changed. Refer to the Configuring Remoting Ports article for more information.

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 the 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.