Delayed email delivery is a common issue for businesses that send out mass emails. The attempted delivery of an email to an incorrect email address can tie up a delivery channel to that ISP for minutes. With limited channels to an ISP, attempting to send messages to bad email addresses can take minutes. At the rate email addresses change, over time your mail servers spend more time attempting to send email to bad email addresses than valid emails addresses. ResponseMaster provides you with a list of email addresses that are bad and can be removed from your list. These are called hard bounces. It will also provide you a list of email address that might be bad. These are called soft bounces. With this information, you can keep your email list clean and up-to-date and your server running efficiently.