It's been so long since I have been here that I have not seen this question before. �I also have a medal - a bronze example for the Military Mail Rifle League, but also undated.
 
There is also a copy of the same style medal in the NSRA display case at Lord Roberts Centre. �However this copy is silver gilt and hallmarked Birmingham 1912.
 
I'm sure I have seen something published about the Millitary Mail somewhere, but I do not have it to hand. �But I'll look around. �I also have a nagging feeling that there may be a postcard in my collection that the Military Mail published. �That will be at home and may be a couple of weeks befiore I get to it.
 
Anyway, I'll post up whatever I find.