Their ability to wield such power is, of course, only facilitated by the lack of natural justice that seems to apply in the online world. Now, there's not much you can do to protect yourself from the crazies in this world if they decide to target you. This article discusses a few of those areas and ways you can minimize your legal liability. Do yourself a favor. Accept it as such and move on.
Life is too short to try and move an immovable force.
Now, having said that, let me say this. It's no way to do business, it doesn't work and it will only cause you and your business untold grief. If you want to mass mail your offer, the only effective way is to cultivate your own opt-in mailing list or to purchase advertising to someone else's. Fertile ground for scam artists, the modus operandi typically starts with an advertisement enticing you to send your message to 100,000 people, all of whom are just waiting with bated breath to receive your offer. All you have to do is pay the owner of the list for access to the email addresses.