Can binaries be posted to a discussion group?

The first commercial Usenet spam, and the one which is often (mistakenly) claimed to be the first Usenet spam of any sort, was an advertisement for legal services entitled "Green Card Lottery - Final One?". It was posted in April 1994 by Arizona lawyers Laurence Canter and Martha Siegel, and hawked legal representation for United States immigrants seeking papers ("green cards").