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IBM has a simple solution to the burgeoning curse of 鈥渟pim鈥� 鈥� spam delivered via instant messaging. In US patent application 2004/0143632, it describes software that automatically responds to every incoming instant message by asking the sender鈥檚 computer for a code that the receiver has previously distributed to family, friends and anyone else they are happy to be contacted by. If the sender鈥檚 computer replies with the required code, the instant message is delivered with no perceptible delay. Otherwise, it is deleted, along with any further messages from the same source.