System and method for detecting and defeating IP address spoofing in electronic mail messages

  • US 7,539,761 B1
  • Filed: 12/19/2003
  • Issued: 05/26/2009
  • Est. Priority Date: 12/19/2003
  • Status: Active Grant
First Claim
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1. A method for detecting a spoofed network connection comprising:

  • receiving a connection from a client;

    delaying sending a greeting message for a delay period, the delay period being less than or equal to a maximum tolerable delay, the maximum tolerable delay being the longest delay that would be tolerated by a valid client;

    monitoring the connection during the delay period;

    if a command is received from the client before the greeting is sent, then identifying the connection as the spoofed connection;

    processing any electronic mail associated with the spoofed connection;

    wherein a spoofed connection electronic-mail message is processed using a process selected from the group consisting of;

    deleting the spoofed-connection electronic-mail message;

    marking the spoofed-connection electronic-mail message; and

    storing the spoofed-connection electronic-mail message in an electronic directory.

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