Internet service providers (ISPs) today are responsible for approximately 90% of all business to consumer (B2C) e-mails and approximately 50-70% of all business to business (B2B) e-mails. And since there’s a very good chance that a single large ISP may alone cover 10-15% of your recipient list, it is crucial to prevent your e-mails from being erroneously classified as spam. Hence, Delivery Watch focuses on ISPs because this is the most efficient way to optimize e-mail deliverability.