Unsolicited message rejecting communications processor

Details Unsolicited message rejecting communications processor Unsolicited message rejecting communications processor

2004-01-20

2009-02-10

Abdullahi, Salad (Department: 2451)

Electrical computers and digital processing systems: multicomput

Computer conferencing

Demand based messaging

C709S204000, C709S205000, C709S219000, C709S225000, C709S226000, C709S245000

Reexamination Certificate

active

07490128

ABSTRACT:
The spam blocker monitors the SMTP/TCP/IP conversation between a sending message transfer agent MTA—0and a receiving message transfer agent MTA—1; catches MTA—0's IP address IP—0, MTA—0's declared domain D—0, sender_address A—0; and recipient A—1; and uses this source and content based information to test for unsolicited messages. It interrupts the conversation when MTA—0sends a command specifying the recipient (an “RCPT” command) 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, sends an error reply to MTA—0which forces MTA—0to terminate the connection with MTA—1before the body of the message is transmitted; else it logs the allowed message, releases the intercepted RCPT command which allows the conversation between MTA—0and MTA—1to proceed.

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