How to send emails to people if they are not in my mailing list?

I have started a website and I want to promote it. However every host provider and email marketing service provider is saying that I can only send emails from there servers if I have my own opt-in mailing list. My question is what should a person do if he just started his website and no one knows about it. At least he should be able to let people know that his website is exist. Can someone give me some links of host providers from which I can send around 5000000 email so that at least people around the world should know about my website. After that the opt-in and opt-out comes into the picture right?
Answer:

Sounds logical but I'm afraid it's still called SPAM if you send emails to people who have never subscribed. A decent opt-in list is the base stone of email marketing, which means email marketing may not be the best way to get attention for a new brand. To spread the words out, you can rely on the SNS sites these days. Use FB/Twitter to show yourself to the public, you'll get traffic to your site, and at the same time grow your list. Give something valuable for free in exchange of people's email add., something digital will be ok, such as free software download/coupons/study materials, etc. on your website and let people know through the social media sites. Of course you can find list purchasing on the market these days, but trust me, it will be the last thing you want to do in email marketing since you'll just never know how bad those lists are before you buy & send.

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