wonder why this is patentable? sounds like preque filtering available in
every mta since the early 90's...
looks for 'helo/mailfrom/recpt to' then drops or accepts connection.
http://www.freepatentsonline.com/7490128.html
United States Patent 7490128
Abstract:
The spam blocker monitors the SMTP/TCP/IP conversation between a sending
message transfer agent MTA—0 and 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—0 sends 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—0 which forces MTA—0 to terminate the connection with MTA—1
before the body of the message is transmitted; else it logs the allowed
message, releases the intercepted RCPT command which allows the
conversation between MTA—0 and MTA—1 to proceed.
--
Michael Scheidell, CTO
Phone: 561-999-5000, x 1259
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