Overview 

After accepting a calendar invite from the meeting organizer and by selecting 'Send the response now' within Microsoft Outlook, the meeting organizer receives a blank email as a response.

Environment

• GFI MailEssentials
• Microsoft Exchange

Root Cause

This issue occurs when GFI MailEssentials is installed on the mentioned Microsoft Exchange versions. GFI MailEssentials adds a disclaimer to outbound Microsoft Outlook appointment and meeting requests. The disclaimer modifies the notification in such a way that makes it unreadable in Microsoft Outlook.

Resolution

The following procedure explains how to disable GFI MailEssentials from adding disclaimers on responses to Microsoft Outlook appointment and meeting requests.

1. Open the product.config file using a text editor such as Notepad: ..\GFI\MailEssentials\AntiSpam\Data\
2. Add the following line as the last key on the line before the closing </appSettings> tag: <add key = "DisableOLMeetingDisclaimer" value = "1"/>.
3. Restart the Microsoft Exchange Transport Service from the Services console.