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MailEssentials | Error: '530 5.7.1 Client was not authenticated' in the Message Delivery Log

Author: Luis Fernandes Updated

Answer

PROBLEM

When email is sent from the GFI MailEssentials relay server to your domain you see in the Message Delivery Log the Status Reply:

530 5.7.1 Client was not authenticated

ENVIRONMENT

  • GFI MailEssentials
  • All Supported Environments

SOLUTION

  1. Open Exchange Management Console > Server Configuration > Hub Transport > Default Receive Connector > Properties
  2. Click Permission Groups
  3. Check the box Anonymous Users
  4. Click Apply then OK
For more information regarding setting up a GFI MailEssentials relay server, please see the below article:

http://www.gfi.com/support/products/gfi-mailessentials/How-to-install-MailEssentials-on-an-SMTP-Relay

​CAUSE

The error means that the Microsoft Exchange server is not configured to accept Anonymous connections.