@John Levine,
The model is like a simple C/R involving Message ID of a mail. The sending
domain provides the Message ID and allows computational time for the
receiving domain and then query the sending domain to send the message.
Apparently i was not aware of the tumbleweed patent, in which case,
Tumbleweed, can claim this model if implemented as a infringement or
complete violation.
Regards,
Ravi
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