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ACTIVE E-MAIL FILTER WITH CHALLENGE-RESPONSE

  • US 20150180812A1
  • Filed: 03/03/2015
  • Published: 06/25/2015
  • Est. Priority Date: 07/16/2002
  • Status: Active Grant
First Claim
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1. A method for filtering electronic mail (e-mail) at a central e-mail server comprising:

  • receiving an e-mail at the central e-mail server, the e-mail having a sender and a recipient;

    sending a challenge message to the sender of the e-mail received by the central e-mail server in response to receiving an email,polling, for a pre-determined period of time, for a response message from the sender in response to the challenge message, wherein the response message addresses the challenge message sent by the central e-mail server;

    determining that a response message has been received from the sender;

    evaluating the response message to determine a classification of the e-mail and sender; and

    transmitting, the received e-mail to the recipient, including the information about the e-mail and the sender, wherein the recipient can store the e-mail and provide a label for the sender based on the information about the e-mail and the sender transmitted from the central e-mail server.

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