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[ietf-dkim] More on layer violations

2010-10-21 11:09:56
Having pondered the layer thing some more, it occurs to me that we have 
several decades of practice with software that validates the format of 
mail messages to a greater or lesser extent, with the emphasis on lesser. 
Different software depends on different bits of the message to be correct, 
which means that some leakage of the message validation into different 
applications is unavoidable unless you're willing to lose mail that has 
flaws that don't matter to the applications that it passes through.

In procmail, for example, doubled subjects only matter if you have a rule 
that does something depending on the subject line.  In MUAs, based on the 
random way existing MUAs handle them, they don't matter at all.

So that's where my SHOULD NOT comes from.  It leaks the bit that matters 
to DKIM.

Regards,
John Levine, johnl(_at_)iecc(_dot_)com, Primary Perpetrator of "The Internet 
for Dummies",
Please consider the environment before reading this e-mail. http://jl.ly
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