The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 2013
Filed:
Apr. 28, 2006
En-yi Liao, Santa Clara, CA (US);
Cheng-lin Hou, Cupertino, CA (US);
Chinghsien Liao, Cupertino, CA (US);
En-Yi Liao, Santa Clara, CA (US);
Cheng-Lin Hou, Cupertino, CA (US);
Chinghsien Liao, Cupertino, CA (US);
Trend Micro Incorporated, Tokyo, JP;
Abstract
In one embodiment, a server computer determines whether an email entering a private computer network is malicious (e.g., part of a directory harvest attack or bounce-source attack) by determining the recipient email address of the email and the Internet Protocol (IP) address of the source of the email. When the server computer determines that the email is malicious, the server computer may reject the email by sending a non-deterministic response to the source of the email. The non-deterministic response may include an error message that is different from the actual reason why the email is being rejected. The rejection may be sent as an immediate reply or postponed, for example.