are you sure there is no attachment?
I do get blanks, but sometimes with request for read receipts, sometimes it has just one square on the page to click as a link (ya right!) with no words.
here is a sender list of a blank emails... these were totally blank and got through my virus scan tool.
bnesme3lkwsb@eastyellow.com <bnesme3lkwsb@eastyellow.com>
wqxilg84kjyju@kingmentioned.com <wqxilg84kjyju@kingmentioned.com>
rfwaww92yfwvo@approachsurprise.com <rfwaww92yfwvo@approachsurprise.com>