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:
Mar. 02, 2010
Filed:
Jan. 20, 2004
Richard Paul White, Pacific Grove, CA (US);
Alan Huang, Menlo Park, CA (US);
Haw-minn LU, San Diego, CA (US);
Ira Victor Spivack, Reno, NV (US);
Richard Paul White, Pacific Grove, CA (US);
Alan Huang, Menlo Park, CA (US);
Haw-minn Lu, San Diego, CA (US);
Ira Victor Spivack, Reno, NV (US);
Engate Technology Corporation, Reno, NV (US);
Abstract
The spam blocker monitors the SMTP/TCP/IP conversation between a sending message transfer agent MTAand a receiving message transfer agent MTA; catches MTA's IP address IP, MTA's declared domain D, from-address A; to-address A, and the body of the message; and uses this source and content information to test for unsolicited messages. It interrupts the conversation when MTAsends a .\r\n end-of-message indicator and uses the various test results to decide if the message is suspected of being unsolicited. If the message is suspected of being unsolicited then it logs the rejected message and sends an error reply to MTAwhich forces MTAto send a QUIT command before the body of the message is transmitted; else it logs the allowed message and releases the intercepted RCPT command which allows the conversation between MTAand MTAto proceed.