For me, as an MTA operator, I'm happy that I have justification for
rejecting messages with the wrong number of From: headers.
I have pointed out at least six times, that in the extremely unlikely
event that bad guys were to send mail with double From headers you can
just dump it, since no real mail has more than one. You don't need DKIM
for that. Spam filters have detected spam by looking for technical
message flaws for over a decade, and this is just another one.
I don't know how to say that any more clearly. Perhaps you can explain it
John Levine, johnl(_at_)iecc(_dot_)com, Primary Perpetrator of "The Internet
Please consider the environment before reading this e-mail. http://jl.ly
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