When you want to send the log using a standard MAPI email client, I get the error message "Unexpected error in the MAPI client". See attached screenshot.
Email client used: Thunderbird 45.
...
Status changed:
New Idea
to Deferred to Support
The question is being discussed here:
http://community.smartbear.com/t5/Desktop-Testing/Unexpected-error-in-the-MAPI-client/m-p/117987