Nearly all abusive e-mail messages carry fake sender addresses. The victims whose addresses are being abused often suffer from the consequences because their reputation gets diminished and they have to disclaim liability for the abuse, or they waste their time sorting out misdirected bounce messages. Worse, a financial loss can be devastating to an organization should its domain end up on a black list because of SPAM runs done via a successful phish of a user account or the discovery of an open relay.
You probably have experienced one kind of abuse or another of your e-mail address in the past
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