Electrical computers and digital processing systems: multicomput – Computer network managing – Computer network access regulating
Reexamination Certificate
2007-07-24
2007-07-24
Winder, Patrice L. (Department: 2145)
Electrical computers and digital processing systems: multicomput
Computer network managing
Computer network access regulating
C709S206000, C709S245000
Reexamination Certificate
active
09548322
ABSTRACT:
A system and method for filtering undesirable e-mail with forged nonexistent sender addresses in real time without sending a message to that sender. A server or proxy rejects electronic messages having a nonexistent sender address by establishing a connection to an authorized mailhost for the domain of the sender address and using discrete transactions during the protocol setup phase to determine if that mailhost will accept mail for the sender address. If the authorized mailhost for the sender address will not accept mail for that address, then the sender address is determined to not exist and the message can be safely rejected.
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Blank Rome LLP
Escom Corporation
Winder Patrice L.
LandOfFree
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