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Managing electronic messages

  • US 20050055410A1
  • Filed: 05/07/2004
  • Published: 03/10/2005
  • Est. Priority Date: 05/09/2003
  • Status: Active Grant
First Claim
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1. In a computer system that monitors electronic messages that are sent from senders to recipients, a method of determining whether an electronic message has been sent from an authorized sender, comprising:

  • receiving an electronic message that includes information identifying a sender of the electronic message; and

    transmitting to the sender a sequence of at least two challenge messages that operate to determine whether the sender is designated as being authorized to send electronic messages to the recipient, the sender being designated as being authorized only if the sender provides appropriate responses to the sequence of at least two challenge messages, wherein a first challenge message and a second challenge message of the sequence are separated by a period of time determined by the computer system.

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