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Block Me If You Can

Depending on the type of spam you get, you might find that much of it originates from a relatively small number of servers. Assuming you don't receive legitimate email from those servers, you can quickly and easily eliminate those spam messages by refusing email messages from those servers. This technique is known as blacklisting. To avoid maintaining the list yourself, you can subscribe to services that do the work for you. Although blacklisting services can be effective for certain types of spam, they can also hurt you. If you use an email server that has been used to send spam, you could find that your email messages are being blocked by these types of services.

Case Study 5-5

Tanya sent an email to a vendor asking for a meeting the following week. Later that afternoon, she noticed a message in her inbox that told her the email hadn't been delivered. She tried sending it again with the same result.

She called the vendor, who agreed to the meeting and told her he would look into why her email was rejected. The next day, he called to tell her that someone else using the same ISP as her company had been sending lots of spam to the vendor. The vendor had blacklisted that IP range, which effectively blocked the spam but also had the unintentional effect of blocking Tanya's email.



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