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One of the important things to do after sending out a marketing campaign is to find and fix (if possible) emails that have been reported as bounced. There are a variety of reasons why emails bounce. A mailbox can be full. A person has moved on and the email is no longer valid. The email server you are trying to send to is not live or working anymore. It is worth while to take the effort to look at these bounced emails - these are not opt outs. The person you are