An email reputation check is a necessary policy to ensure inbox delivery standards of emails that matter to the recipient. Emails that contain unsolicited content by the recipient will be marked as spam by the ISP and, as a result, will end up in the spam section. The content of the message is incorrectly marked as spam and thus not delivered directly to the inbox. The higher the score, the more likely the ISP will provide emails directly to recipient inboxes and not to the spam/junk section. Each ISP has different standards when assigning a sender reputation score.