Approaches to fighting spam in an Exchange Server environment
Unsolicited e-mail messages, also known as junk e-mail messages or spam, are messages sent from a single source with the intent of broadcasting to many mailboxes at one time. The goal of the spammer is to deliver the message to the end user so that they open it and actually read it, which is how the spammer makes money. There are definitely many different techniques spammers use to put the messages in gray areas, where they cannot be easily detectable at the gateway level.
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