Crazy. The queue has nothing waiting for you to go out.
The mail log did send something last night:
2013-10-15 18:18:14 u49613419 3oCtTH-1VEwwE2HGl-00IXQY => xxxx msmtp.perfora.net[172.19.143.3] 250 Message 0MNZoo-1VQ88h2ZZa-006rRO accepted by mrus4.perfora.net
Lets make sure gmail isnt hiding it..
can put these in your search and see what you get:
I'll also email this to you