I managed to get this by enabling an email push to Outlook, where outlook processes a rule, that runs a VBA script to Start Excel, log the date-time stamp, save the book, shut down Excel and wait for the next email.
I have had an email noting the I/O turned off not show up....dunno why...it was either never pushed, or never received...who knows..just 1 though.
Now its off to add VBA to do time subtraction and gallons used calculations.