INFORMATIVE NOTE: A message forwarder may remove DKIM-Signature
header fields if it modifies a message in a way that makes it
implausible that a subsequent verifier could verify the
signature, e.g., if it reorders the MIME parts in a message
or flattens an HTML message to plain text.
What does "implausible" mean?
It means the same thing it does anywhere else. I realize you think that
verifiers can undo any change a mailing list may do to a message. You're
wrong, but I don't want to get hung up on that again. That's why I used
examples where the message bits are completely mangled.
And I disagree about this in general; the forensics of signatures are as
worthwhile as the ultimately unverifyable received headers which no RFC
suggests that you remove.
It says "may". Depends on what you expect to be downstream of you.
Regards,
John Levine, johnl(_at_)iecc(_dot_)com, Primary Perpetrator of "The Internet for
Dummies",
Information Superhighwayman wanna-be, http://johnlevine.com, Mayor
"I dropped the toothpaste", said Tom, crestfallenly.
_______________________________________________
NOTE WELL: This list operates according to
http://mipassoc.org/dkim/ietf-list-rules.html