How do I tell majordomo to handle “get”-ing of binary files?
Majordomo is not designed to be a general-purpose file-by-mail system. If you want to do anything more than trivial “get”-ing of text files (archives, etc) than you should get and install ftpmail. Majordomo has hooks to allow transparent access to files via ftpmail (see majordomo.cf). See the beginning of this FAQ for where to get ftpmail.