Every ESP (email service provider) have integrated spam scoring services that scan your emails before they deliver them to their end users. They look for spam keywords such as “Lottery”, “Medication”, “Rolex Replicas”, as well as other variable such as public spam databases and blacklists to judge if you are fit for
I- Delivery vs Rejection
II- Inbox vs Spam/Junk vs Promotions tab.
VBOUT uses SpamAssassin service to score your email content and give you a ‘general’ benchmark on how your keywords are being scored.