Method and apparatus for source-based message authorization and rejection
View Patent ↗Unwanted electronic messages can be avoided by screening them before they enter a receiving client. Only messages from authorized sending parties are passed to the receiving client while messages from sending parties not previously authorized are discarded or returned. The same arrangement can be used with cellular and conventional telephones, facsimile machines, and other devices.
1. A method for preventing unwanted messages from reaching a receiving device, comprising:
compiling databases comprising entries of authorized and unauthorized originators of messages;
receiving a message from a sending party;
identifying the sending party; and
selecting an exclusive mode of operation corresponding to the database with the least number of entries, where the modes of operation comprise an allowing mode for authorized originators and a blocking mode for unauthorized originators, or where the databases are of equal size, defaulting to a predetermined mode, where
in the allowing mode, determining by reference to the database of authorized originators whether the sending party is an authorized originator and, in response, passing the message of an authorized originator to the receiving device or, if the sending party is not an authorized originator, blocking the message; or
in the blocking mode, determining by reference to the database of unauthorized originators whether the sending party is an unauthorized originator and, in response, blocking the message of an unauthorized originator or, if the sending party is not an unauthorized originator, passing the message to the receiving device.
2. A method as set forth in claim 1 , where, in either the allowing mode or blocking mode, the step of blocking further comprises selectively discarding or returning the message to the sending party.
3. A method as set forth in claim 1 , where, in either the allowing mode or blocking mode, the step of blocking further comprises returning the message to the sending party.
4. An apparatus for preventing unwanted messages from reaching a receiving device, comprising:
databases comprising entries of authorized and unauthorized originators of messages;
means for receiving a message from a sending party;
means for identifying the sending party; and
a screening mechanism, responsive to the means for comparing, comprising means for selecting an exclusive mode of operation corresponding to the database with the least number of entries, where the modes of operation comprise an allowing mode for authorized originators and a blocking mode for unauthorized originators, or where the databases are of equal size, defaulting to a predetermined mode, where
in the allowing mode, means for determining by reference to the database of authorized originators whether the sending party is an authorized originator and, means, responsive to the means for determining by reference to the database of authorized originators, for passing the message of an authorized originator to the receiving device or, if the sending party is not an authorized originator, blocking the message; or
in the blocking mode, means for determining by reference to the database of unauthorized originators whether the sending party is an unauthorized originator and, means, responsive to the means for determining by reference to the database of unauthorized originators, for blocking the message of an unauthorized originator or, if the sending party is not an unauthorized originator, passing the message to the receiving device.
5. An apparatus as set forth in claim 4 , where
in the allowing mode, the means responsive to the means for determining further comprises means for selectively discarding or returning the message to the sending party; and
in the blocking mode, the means responsive to the means for determining further comprises means for selectively discarding or returning the message to the sending party.
6. An apparatus as set forth in claim 4 , where
in the allowing mode, the means responsive to the means for determining further comprises means for selectively returning the message to the sending party; and
in the blocking mode, the means responsive to the means for determining further comprises means for selectively returning the message to the sending party.