It wasn't targeted. Mostly they were trying to exploit confirmation/bounceback spam as the form accepted an email address. The spammers never got beyond probing the system. I would get one or two messages at a time. They realized it wasn't actually sending email out and then go elsewhere until the next spammer came along. The system didn't actually mail anything. It dropped it into a rabbitmq broker running at the colo, which then shoveled that back to the house where it eventually printed on a dot matrix printer.
Originally planned to use a proper teleprinter, except mine is designed to sit in the the cramped racks of missile silos, so it has a rather obnoxious fan in it. It's also fully electronic and uses a dot matrix mechanism rather than something more fun. It's only redeeming quality is the VFD for message composition.
