Internal error: SO_OBJECT_MIME_GET Exception: 2 when sending email

If you have done a clientcopy (cust) and then try to send an email from the new client you will probably get Internal Error: SO_OBJECT_MIME_GET Exception.

This is often very easy to fix.
1. Go to transaction SCOT
2. Settings - Default Domain
3. Enter your default domain. asfff.com

Thats it;)