As a "young-un", I had never heard of V-mail before, not the kind Jack talks about on several of his shows at least.
There's actually a couple nice articles about Victory Mail here:
http://www.postalmuseum.si.edu/exhibits/2d2a_vmail.html
http://www.postalmuseum.si.edu/museum/1d_V-Mail.html
And several old newspaper ads on Victory Mail here:
http://scriptorium.lib.duke.edu/dynaweb ... __BookView
Just thought I'd pass them along...