That post title looks like a classic "get-rich-quick" scheme for spammers, which usually leads to a few not-so-great outcomes:
Using "unlimited free" SMTPs usually results in your emails going straight to spam or getting your IP banned instantly. Download How Get Unlimited Free SMTP Method txt
The "method" might just be a trick to steal your own email credentials. That post title looks like a classic "get-rich-quick"