Overview
Runtime Error: Server Error in '/MailEssentials' Application triggered when accessing the MailEssentials Configuration UI. The issue is caused by a misconfigured .NET Framework version for the IIS application pools and MailEssentials.
Solution
- Update the .NET Framework to at least version 4.5
- Configure the MailEssentials and MailEssential Service pool in IIS to use .NET Framework v4
- Restart the server
Confirmation
The MailEssentials Configuration UI is now accessible.