Symptoms
In a Microsoft Exchange Server 2007 environment, a user sends an email message that contains a recipient that uses a custom (non-SMTP) address type. This address only contains spaces. In this situation, the EdgeTransport.exe process crashes and then restarts. Additionally, you find the following events in the Application log:
Cause
This issue occurs because an exception is generated by the Exchange Server 2007 server when the custom address only contains spaces.
Resolution
To resolve this problem, install the following update rollup:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.