Message challenge response

摘要

A system and method are disclosed for registering a email sender for the purpose of sending an email message to an email receiver including receiving a challenge message wherein the challenge message includes a machine answerable question; processing the challenge message to determine that it is a challenge message sent for the purpose of authorizing delivery of the email message; analyzing the question to determine a valid response to the challenge message; and sending the valid response that includes the answer wherein a nontrivial amount of resources are required to send the valid response.

主权项

1. A method of registering an electronic-mail (e-mail) sender for the purpose of sending e-mail messages to an e-mail recipient, the method comprising:
receiving an e-mail sent by the e-mail sender to the e-mail recipient; executing instructions stored in memory, wherein execution of the instructions by a processor of an independent third-party auditor generates a challenge message in response to an e-mail message received by the e-mail recipient, wherein the challenge message does not invite a response to the challenge message from the e-mail sender; sending the challenge message to the e-mail sender; receiving a bounce error message associated with the challenge message within a predetermined period of time after the sending of the challenge message, wherein the bounce error message is evaluated by the independent third-party auditor; and sending a report generated by the independent third-party auditor to the e-mail recipient, the report indicating receipt of the bounce error message during the predetermined period of time, wherein the e-mail recipient classifies e-mail messages from the e-mail sender based on the report.