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Masking an email's source IP address

Exchange Server security expert Richard Luckett discusses the most commonly used method by spammers to mask their source IP address.

When an email is sent, it attaches an IP address. Can that IP address be modified so when the recipient receives the email, another IP address appears?
Yes, but it is not done by simply editing the email header. The most common way to do this is by using a forwarder. In fact, this method is commonly used by spammers to mask their source IP address. By forwarding email though a list server or another host, the email header will not display the source IP address of the actual sender.

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