Look at TitanKey as another type of C/R system that issues challenges at
the SMTP level. That's essentially what it is. As for pros and
cons of C/R
systems, that has been debated before many times. C/R systems exist and
will increase, we are just making sense out of chaos here. Perhaps Eric
Dean can add the STMP-reject method to his C/R draft.
Just a point of clarification..I'm looking at C/R interworking..a method for
automation and loop prevention...not at specifying how to build a C/R
system. With respect to this particular response code method...I'm not sure
what should be done for interworking systems with that feature.
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