After clicking on the "Send to Report" button, Toad generates an Excel within Toad. In that screen, when clicking on "Email" button, Toad throws a MAPI error:
“An error occurred when sending email with error message General MAPI failure.”
Casued by Windows UAC being enabled
RESOLUTION 1: On Windows 7, right-click on the Toad short cut and choose "Run as administrator"
RESOLUTION 2: Turn of UAC from the Windows Control Panel