Spam is 1,000,000 emails to some random list you bought for $25.

Nope. Spam is unsolicited e-mail - there are laws in quite a lot of countries regulating exactly this.

They're generally only for individuals, not emailing companies.

To be honest, if you think 100 emails a day is bad, I honestly would not consider entrepreneurship as a career.

You will have to do far more grey area things than that to succeed.

Nice attitude you have there. No, you don't have to do illegal or grey area things - and yes, I consider myself an entrepreneur.