It sounds like these people are small scale spammers, doing things similar to 419 scams. A bit annoying, but really low volume. The kind I'm referring to are s

It sounds like these people are small scale spammers, doing things similar to 419 scams. A bit annoying, but really low volume. The kind I'm referring to are single organizations which aim to send out 10s or possibly 100s of a millions of spam emails _every day_. I would expect there to be at least dozens of organizations at this scale. They're the ones who use botnets, open relays, and weird characters in their emails to get around filters.