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Blocked Because of Relay

When an email server isn't configured properly or is misconfigured, it could be vulnerable to being abused by email attackers. In this section, you see how spammers can take advantage of this situation to send email messages that are traced back to the victim rather than the spammer.

Case Study 6-1

Lance sent an email to all his customers letting them know about a new promotion offering a significant discount. A short while later, he heard his email ding and checked to see whether it was one of his customers who wanted to make a purchase.

The email was about one of his customers, but not the email he was expecting. The email informed Lance that all email from his company was being blocked because of excessive spam emails. Lance knew his company used email to send messages to their customers, but it had strict policies about sending email only to users who requested it. Lance didn't want to lose this account, so he called his contact to resolve the issue.

His contact was happy to hear about the discounts and promised to look into the problem. Later that afternoon, his contact called back. He said the system administrators had gathered huge numbers of spam messages from Lance's company and were unwilling to release the blocks they had put into place. Lance promised to check with his technical staff to make sure they hadn't been sending these emails.



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